Today's Image of the Day from the European Space Agency features Abell S1063, a massive galaxy cluster located about 4.5 billion light-years from Earth. The galaxy cluster was captured by the Webb telescope in stunning detail.



According to <a href="https://www.esa.int/ESA_Multimedia/Images/2025/05/Webb_glimpses_the_distant_past" target="_blank" rel="noreferrer noopener">ESA</a>, the image is what’s known as a deep field - a long exposure of a single area of the sky, collecting as much light as possible to draw out the most faint and distant galaxies that don’t appear in ordinary images.&nbsp;



<h2 class="wp-block-heading" id="h-galaxies-of-the-early-universe">Galaxies of the early universe </h2>



Composed of nine separate snapshots taken at different near-infrared wavelengths over roughly 120 hours, this image represents Webb’s most detailed and deepest view of a single target so far.&nbsp;



Thanks to the gravitational lensing effect of Abell S1063, astronomers can peer deeper into the past than ever before - possibly viewing some of the universe’s very <a href="https://www.earth.com/news/ancient-galaxies-formed-from-the-earliest-elements-in-the-universe/" target="_blank" rel="noreferrer noopener">first galaxies</a>.



“The eye is first drawn, in this new NASA/ESA/CSA James Webb Space Telescope Picture of the Month, to the central mega-monster that is galaxy cluster Abell S1063. This behemoth collection of galaxies, lying 4.5 billion light-years from Earth in the constellation Grus (the Crane), dominates the scene,” noted ESA.



“Looking more closely, this dense collection of heavy galaxies is surrounded by glowing streaks of light, and these warped arcs are the true object of scientists’ interest: faint galaxies from the universe’s distant past.”



<h2 class="wp-block-heading" id="h-what-is-a-galaxy-cluster">What is a galaxy cluster?</h2>



Galaxy clusters are the largest known gravitationally bound systems and include not just galaxies, but also vast amounts of hot, X-ray-emitting gas and <a href="https://www.earth.com/news/the-true-nature-of-dark-matter-may-be-revealed-in-a-supernova/" target="_blank" rel="noreferrer noopener">dark matter</a>.&nbsp;



The galaxies within a cluster move through this hot intracluster medium, and their interactions can lead to phenomena like galaxy mergers or the stripping of gas from galaxies.&nbsp;



Galaxy clusters are important for studying the large-scale structure of the universe, the behavior of dark matter, and the evolution of galaxies over cosmic time.



<h2 class="wp-block-heading" id="h-hundreds-of-galaxies-bound-together-nbsp">Hundreds of galaxies bound together&nbsp;</h2>



As one of the most densely populated clusters known, Abell S1063 contains hundreds of galaxies bound together by gravity.&nbsp;



Its immense mass makes it an excellent example of a gravitational lens - a cosmic phenomenon where the cluster’s gravity bends and magnifies the light from galaxies far behind it.&nbsp;



This effect allows astronomers to observe incredibly faint and distant <a href="https://www.earth.com/news/milky-way-like-galaxies-were-present-in-the-early-universe/" target="_blank" rel="noreferrer noopener">galaxies</a> that would otherwise be beyond our detection limits.



<h2 class="wp-block-heading" id="h-studying-galaxy-evolution">Studying galaxy evolution</h2>



The cluster has been the focus of several major observational campaigns. It was prominently featured in the Hubble Space Telescope’s Frontier Fields program, which used its gravitational lensing power to study the early universe.&nbsp;



“The new imagery from Webb’s Near-Infrared Camera (NIRCam) takes this quest even further back in time,” said ESA.



“This image showcases an incredible forest of lensing arcs around Abell S1063, which reveal distorted background galaxies at a range of cosmic distances, along with a multitude of faint galaxies and previously unseen features.”



These observations are helping scientists probe the Cosmic Dawn era - the period shortly after the Big Bang.



<h2 class="wp-block-heading" id="h-exploring-the-cosmic-dawn-nbsp">Exploring the Cosmic Dawn&nbsp;</h2>



The Cosmic Dawn refers to a time in the history of the universe when the first stars and galaxies began to form and shine. This pivotal era occurred roughly between 100 million and 1 billion years after the Big Bang.&nbsp;



During the Dark Ages, the <a href="https://www.earth.com/news/fastest-feeding-black-hole-found-in-the-early-universe/" target="_blank" rel="noreferrer noopener">universe</a> had cooled enough for neutral hydrogen to form, but no luminous objects yet existed to light it up.&nbsp;



The birth of the first stars - often massive and short-lived - marked the beginning of the Cosmic Dawn. These stars emitted intense ultraviolet radiation, which gradually ionized the surrounding hydrogen gas in a process known as reionization.&nbsp;



This transformed the universe from a cold, opaque environment into one that was transparent to light, enabling the large-scale structure of the cosmos to take shape.



<h2 class="wp-block-heading" id="h-the-constellation-grus">The constellation Grus</h2>



Grus is a <a href="https://www.earth.com/news/super-jupiter-discovered-in-the-great-bear-constellation/" target="_blank" rel="noreferrer noopener">constellation</a> in the southern sky, its name derived from the Latin word for "crane," a type of large, graceful bird.&nbsp;



It was introduced in the late 16th century by the Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman, during an era of celestial charting tied to European exploration of the southern hemisphere.&nbsp;



Grus is part of a group of constellations known as the "Southern Birds," which also includes Phoenix, Tucana, and Pavo.



This constellation lies near the celestial south pole and is best seen from the Southern Hemisphere during the months of August through October.&nbsp;



Image Credit: ESA/Webb, NASA &amp; CSA, H. Atek, M. Zamani



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Hundreds of galaxies illuminate the early universe 

Today's Image of the Day from the European Space Agency...

Today's Image of the Day from the European Space Agency features a Copernicus map of scorching summer temperatures across southern Europe.



“A powerful heatwave has been gripping large parts of southern Europe and North Africa, pushing air temperatures beyond seasonal norms and triggering widespread health and wildfire alerts. Among the hardest-hit countries are Spain, France, Italy, Greece, Cyprus, and Algeria,” said <a href="https://www.esa.int/ESA_Multimedia/Images/2025/07/Southern_Europe_s_land_and_sea_sizzles">ESA</a>.



“This image, a mosaic from five overlapping orbital passes in the morning of 29 June 2025, was captured by the <a href="https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-3">Copernicus Sentinel-3</a> mission’s Sea and Land Surface Temperature Radiometer.”&nbsp;



<h2 class="wp-block-heading" id="h-tracking-land-surface-temperatures-nbsp">Tracking land surface temperatures&nbsp;</h2>



According to ESA, the image reveals the temperature of the land surface - not air temperature.



Tracking land surface temperature is essential for predicting weather and climate patterns, assessing wildfire risk, helping <a href="https://www.earth.com/news/rising-temperatures-threaten-the-future-of-banana-farming/">farmers</a> plan irrigation, and informing urban design strategies to reduce heat.



“Unlike measurements of air temperature, this satellite instrument measures the actual thermal energy emitted from Earth’s surface, which typically registers higher than air temperatures.”



<h2 class="wp-block-heading" id="h-heat-dome-over-western-europe-nbsp">Heat dome over Western Europe&nbsp;</h2>



The image includes information from the Copernicus Marine Service, which shows that <a href="https://www.earth.com/news/ocean-temperatures-are-rising-faster-than-expected-and-likely-to-accelerate/">surface temperatures</a> are also hot across the Mediterranean Sea.



The ongoing heatwave is fueled by a high-pressure system stalled over Western Europe, known as a “heat dome.” This system traps hot, dry air beneath it, causing temperatures to rise steadily.&nbsp;



As it moves eastward, the dome pulls in even more hot air from North Africa, intensifying the extreme heat across the region.



<h2 class="wp-block-heading" id="h-heat-dome-over-the-united-states-nbsp">Heat dome over the United States&nbsp;</h2>



In June 2025, a heat dome developed over the central and eastern United States. It began forming around June 20 and persisted through the week.



The heat dome covered a large part of the country - from the Great Plains through the Midwest, Upper Midwest, Ohio and Tennessee River Valleys - and extended into the Mid‑Atlantic and Northeast regions.



More than 280 daily high-temperature records were shattered across the U.S., affecting some 130 million people under <a href="https://www.earth.com/news/extreme-heat-impacts-our-daily-routines-and-transportation/">heat warnings</a> or advisories.&nbsp;



Cities like New York, Baltimore, Philadelphia, Boston, Newark, Providence, and Raleigh saw triple-digit highs - some reaching more than 105 degrees.



<h2 class="wp-block-heading" id="h-public-health-concerns">Public health concerns</h2>



The heat dome not only caused dangerous daytime highs but also oppressive night-time warmth, with low temperatures often staying above 80 °F due to trapped heat. 



This persistent warmth strained power grids, led to emergency declarations, and triggered significant public health concerns.



Infrastructure suffered too: roads buckled in Missouri and softened asphalt sank vehicles in New York City, while a Baltimore Amtrak train stalled in a tunnel from the heat. 



Emergency measures included power reductions, heat shelters, and utility advisories in several states.



<h2 class="wp-block-heading" id="h-heat-domes-and-climate-change">Heat domes and climate change</h2>



Climate scientists emphasize that heat domes are fueled by anthropogenic <a href="https://www.earth.com/news/climate-change-earth-energy-imbalance-temperature-rise/">climate change</a>. These high-pressure patterns are occurring more frequently and enduring longer due to warming oceans, Arctic amplification, and altered jet stream behavior.&nbsp;



As global temperatures rise, the atmosphere can hold more moisture and energy, which intensifies heatwaves and makes them more persistent.&nbsp;



In particular, the weakened and meandering jet stream - a result of a warming Arctic - is allowing systems like heat domes to stall over regions for days or even weeks.



<h2 class="wp-block-heading" id="h-adapting-to-a-hotter-future">Adapting to a hotter future</h2>



Recent climate models show that events like the June 2025 heat dome (once considered rare), are becoming increasingly common.&nbsp;



What used to be a one-in-100-year heat event in many U.S. cities may now occur once a decade or even more often. This shift has serious implications not just for human health, but also for infrastructure, agriculture, and energy systems.&nbsp;



Power grids are pushed to their limits, roads and railways buckle under extreme heat, and crops suffer from both high temperatures and water stress.



Public health officials are especially concerned about the cumulative toll of prolonged <a href="https://www.earth.com/news/extreme-heat-is-pushing-parts-of-earth-beyond-human-survival/">extreme heat</a>. 



Nights that remain hot offer little relief and are particularly dangerous for vulnerable populations such as the elderly, young children, and people with chronic health conditions. 



Without sustained adaptation efforts - such as redesigning cities to reduce heat retention, expanding access to cooling centers, and modernizing energy infrastructure - the human and economic cost of extreme heat is expected to grow significantly in the coming decades.



Image Credit: ESA



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Heat dome scorches Southern Europe 

Today's Image of the Day from the European Space Agency features the Eagle Nebula, also known as Messier 16, which is located about 7,000 light-years away in the constellation Serpens.



The Eagle Nebula is one of the most iconic star-forming regions in our galaxy. It’s a vast cloud of gas and dust stretching roughly 70 light-years across. 



<h2 class="wp-block-heading" id="h-pillars-of-creation-nbsp">Pillars of Creation&nbsp;</h2>



What makes it especially famous is a portion of the <a href="https://www.earth.com/news/six-rogue-worlds-discovered-inside-a-young-star-forming-nebula/">nebula</a> captured by the Hubble Space Telescope in 1995 - an area called the "Pillars of Creation."&nbsp;



Some of these towering columns of gas are several light-years tall. The towers resemble sculpted fingers reaching out into space. Inside these pillars, new <a href="https://www.earth.com/news/serpens-nebula-image-reveals-how-stars-are-born/">stars</a> are being born as gravity pulls material together into dense cores that eventually ignite nuclear fusion.



The Pillars of Creation are often cited as a poetic example of the cosmic cycle of birth and destruction - where new stars are born even as the surrounding material is slowly destroyed by radiation.



<h2 class="wp-block-heading" id="h-hubble-image-of-the-eagle-nebula-nbsp">Hubble image of the Eagle Nebula&nbsp;</h2>



“This towering structure of billowing gas and dark, obscuring dust might only be a small portion of the Eagle Nebula, but it is no less majestic in appearance for it,” said <a href="https://esahubble.org/images/heic2507a/">ESA</a>.



“The new Hubble image is part of ESA/Hubble’s 35th anniversary celebrations. The cosmic cloud shown here is made of cold hydrogen gas, like the rest of the Eagle Nebula. In such regions of space new stars are born among the collapsing clouds.”&nbsp;



The hot, energetic stars emit intense ultraviolet light and powerful stellar winds that erode and sculpt the surrounding gas. The result is the creation of fantastical structures - like the narrow pillar with a blossoming head featured in the new image.



<h2 class="wp-block-heading" id="h-light-and-shadow-in-the-eagle-nebula">Light and shadow in the Eagle Nebula</h2>



The thick material in the pillar blocks most light, appearing dark and heavy against the backdrop. However, its edges glow where light from the more distant nebula shines through.&nbsp;



The striking colors reflect the chemistry and physics at play: blues signal ionized oxygen, reds indicate glowing hydrogen, and orange shows where starlight has managed to pierce the dust.



<h2 class="wp-block-heading" id="h-a-structure-under-siege">A structure under siege</h2>



Just out of frame lie the very stars responsible for shaping this dramatic pillar. Their radiation and winds continue to batter the cloud, compressing the gas and potentially triggering the birth of even more stars within.



For now, the pillar holds firm, but this stability is temporary. Over time, the relentless energy from newly formed <a href="https://www.earth.com/news/fluffy-molecular-clouds-may-change-our-understanding-of-star-formation/">stars</a> will eventually erode the entire structure.



“While the starry pillar has withstood these forces well so far, cutting an impressive shape against the background, eventually it will be totally eroded by the multitude of new stars that form in the Eagle Nebula,” explained ESA.



<h2 class="wp-block-heading" id="h-life-cycle-of-the-milky-way">Life cycle of the Milky Way</h2>



The nebula’s location in the Sagittarius Arm - one of the Milky Way’s major spiral arms - places it in a zone bustling with similar star-forming regions. This highlights the role of the Eagle Nebula in shaping the structure and the future of our galaxy.



Studies of the Eagle Nebula have revealed that the region is rich in young, hot stars - some of which are only a few million years old. These stars are in various stages of development, providing a natural laboratory for astronomers to study stellar life cycles.&nbsp;



<h2 class="wp-block-heading" id="h-evolution-of-the-eagle-nebula-nbsp">Evolution of the Eagle Nebula&nbsp;</h2>



Within the Eagle Nebula, there is a variety of stellar processes occurring in close proximity. Some stars are still forming within dense clouds of gas, while others have already matured and begun to emit powerful ultraviolet radiation.&nbsp;



The ongoing interaction between <a href="https://www.earth.com/news/star-formation-reignited-in-the-galaxy-leo-p-after-billions-of-years/">young stars</a> and their environment drives the evolution of the nebula itself.&nbsp;



As newly formed stars heat and disperse the gas and dust around them, they trigger further waves of star formation - or in some cases, halt it altogether.&nbsp;



This feedback loop not only influences the pace of star birth in the Eagle Nebula but also contributes to the broader life cycle of matter within the <a href="https://www.earth.com/news/milky-way-collision-may-change-everything-we-know-about-our-galaxy/">Milky Way</a>, enriching the galaxy with heavier elements forged in stellar cores.



Image Credit: ESA/Hubble &amp; NASA, K. Noll



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Eagle Nebula: Carving light from darkness

Today's Image of the Day from the European Space Agency features a portion of the Rosette Nebula, captured by the Hubble Space Telescope.



The Rosette Nebula is a vast cloud of gas and dust located in the constellation Monoceros, also known as the Unicorn.



Shaped like a blooming rose in deep space, it lies about 5,200 light-years from Earth and spans roughly 100 light-years in diameter.&nbsp;



<h2 class="wp-block-heading" id="h-image-of-the-rosette-nebula">Image of the Rosette Nebula </h2>



“<a href="https://www.earth.com/news/35-years-of-hubble-the-telescope-that-changed-our-view-of-the-universe/" target="_blank" rel="noreferrer noopener">Hubble</a> zooms into a small portion of the nebula that is only four light-years across (the approximate distance between our Sun and the neighboring Alpha Centauri star system),” noted <a href="https://www.esa.int/ESA_Multimedia/Images" target="_blank" rel="noreferrer noopener">ESA</a>.



“Dark clouds of hydrogen gas laced with dust are silhouetted across the image. The clouds are being eroded and shaped by the seething radiation from the cluster of larger stars in the center of the nebula.”&nbsp;



“An embedded star seen at the tip of a dark cloud in the upper right portion of the image is launching jets of plasma that are crashing into the cold cloud around it. The resulting shock wave is causing a red glow. The colors come from the presence of hydrogen, oxygen, and nitrogen.”



<h2 class="wp-block-heading" id="h-distinct-appearance-of-rosette">Distinct appearance of Rosette</h2>



Stellar winds and ultraviolet light are gradually carving out a cavity in the nebula’s center while simultaneously triggering new waves of <a href="https://www.earth.com/news/fluffy-molecular-clouds-may-change-our-understanding-of-star-formation/" target="_blank" rel="noreferrer noopener">star formation</a> along its dense edges.&nbsp;



The Rosette Nebula is often studied to understand the life cycle of stars and the complex interactions between radiation and interstellar material. 



Its intricate structure and visual appeal have made it a favorite target for both professional astronomers and astrophotographers.



<h2 class="wp-block-heading" id="h-nebulae-that-are-similar-to-rosette">Nebulae that are similar to Rosette</h2>



Compared to other famous nebulae, the Rosette Nebula stands out for its symmetry and floral appearance, which give it a distinct, iconic look. It's often compared to the Orion Nebula, which is much closer to Earth at about 1,300 light-years away and far brighter in the night sky. 



The <a href="https://www.earth.com/news/orion-nebula-destroys-an-oceans-worth-of-water-every-month/" target="_blank" rel="noreferrer noopener">Orion Nebula</a> is a bustling stellar nursery visible even to the naked eye, while the Rosette requires a telescope and is more diffuse and fainter despite being larger in actual size.



The Eagle Nebula, home to the famous "Pillars of Creation," shares a similar process of star formation and sculpting by radiation, but the Eagle has more dramatic, finger-like structures.&nbsp;



<h2 class="wp-block-heading" id="h-stellar-feedback-and-cosmic-evolution">Stellar feedback and cosmic evolution</h2>



The Lagoon Nebula and the Trifid Nebula, both in the constellation Sagittarius, also resemble the Rosette in that they are active star-forming regions, but they lie in a denser part of the <a href="https://www.earth.com/news/astronomers-found-something-strange-at-core-of-milky-way-galaxy-webb-meerkat/" target="_blank" rel="noreferrer noopener">Milky Way</a> and are often surrounded by a rich starfield.



What makes the Rosette Nebula particularly interesting scientifically is the clear interaction between its central star cluster and the surrounding gas, offering a textbook example of how massive stars influence their environment. 



It may not be as visually iconic as the Orion or as dynamic as the Eagle, but it's a beautiful and instructive example of stellar feedback and cosmic evolution.



<h2 class="wp-block-heading" id="h-history-of-the-rosette-nebula">History of the Rosette Nebula </h2>



The history of the Rosette Nebula, like many deep-sky objects, is a blend of observational discovery and increasing scientific understanding over time. 



Although it was likely spotted by earlier astronomers, its first documented observation was in the late 17th century by John Flamsteed, the first Astronomer Royal of England.&nbsp;



However, the <a href="https://www.earth.com/news/six-rogue-worlds-discovered-inside-a-young-star-forming-nebula/" target="_blank" rel="noreferrer noopener">nebula</a> itself was not fully recognized as a distinct object until the advent of astrophotography and improved telescopes in the 19th and 20th centuries.



<h2 class="wp-block-heading" id="h-star-clusters-of-the-enormous-cloud">Star clusters of the enormous cloud</h2>



The central star cluster, NGC 2244, was cataloged separately by William Herschel in the 18th century. Over time, astronomers realized that this cluster was embedded in a much larger, complex nebular structure.&nbsp;



As telescope technology advanced, astronomers identified several parts of the Rosette Nebula and gave them separate designations, including NGC 2237, NGC 2238, NGC 2239, and NGC 2246 - essentially referring to different regions of the same enormous cloud.



Observations from space-based telescopes like Chandra (X-rays) and Spitzer (infrared) helped map the energetic processes inside the nebula, revealing how radiation and stellar winds from NGC 2244 are triggering the birth of new stars in its surrounding regions.



Image Credit: ESA



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Rosette Nebula: A flower blooming in deep space

Today's Image of the Day from the European Space Agency features UGC 5460, a spiral galaxy that is located about 60 million light-years away in the constellation Ursa Major.&nbsp;



“This image combines four different wavelengths of light to reveal UGC 5460’s central bar of stars, winding spiral arms and bright blue star clusters. Also captured in the upper left-hand corner of this image is a far closer object: a star just 577 light-years away in our own galaxy,” said <a href="https://www.esa.int/ESA_Multimedia/Images" target="_blank" rel="noreferrer noopener">ESA</a>.



“UGC 5460 has hosted two recent supernovae named SN 2011ht and SN 2015as. It’s because of these two stellar explosions that Hubble targeted this galaxy, collecting data for three observing programmes that aim to study various kinds of supernovae.”&nbsp;



<h2 class="wp-block-heading" id="h-a-core-collapse-supernova-nbsp">A core-collapse supernova&nbsp;</h2>



SN 2015as is an example of a core-collapse supernova. This type of <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernova</a> occurs when the core of a massive star - typically with more than 8 times the mass of the sun - can no longer support its own gravity after exhausting its nuclear fuel. 



This causes the core to collapse under its own weight, leading to an extremely violent explosion. The collapse triggers the release of an enormous amount of energy, expelling the outer layers of the star into space.



In the aftermath of the explosion, a dense <a href="https://www.earth.com/news/shockingly-bright-carbon-monoxide-detected-in-supernova-remnant/" target="_blank" rel="noreferrer noopener">remnant</a> is created. This is often a neutron star or black hole, depending on the mass of the original star. Core-collapse supernovae are some of the most powerful events in the universe.



According to ESA, Hubble observations of SN 2015as will help researchers understand what happens when the expanding shockwave of a <a href="https://www.earth.com/news/supernova-dandelion-year-1181-leaves-behind-zombie-star-defying-death/" target="_blank" rel="noreferrer noopener">supernova</a> collides with the gas that surrounds the exploded star.



<h2 class="wp-block-heading" id="h-rare-stars-with-large-eruptions-nbsp">Rare stars with large eruptions&nbsp;</h2>



“SN 2011ht might have been a core-collapse supernova as well, but it could also be an impostor called a luminous blue variable. Luminous blue variables are rare stars that experience eruptions so large that they can mimic supernovae,” noted ESA.



“Crucially, luminous blue variables emerge from these eruptions unscathed, while stars that go supernova do not. Hubble will search for a stellar survivor at SN 2011ht’s location, and the explosion’s identity may be revealed at last.”



<h2 class="wp-block-heading" id="h-what-is-a-spiral-galaxy">What is a spiral galaxy?</h2>



Spiral galaxies are some of the most recognizable and beautiful structures in the universe. They are known for their distinctive arms that spiral outward from a central bulge.&nbsp;



These galaxies are typically composed of stars, gas, dust, and dark matter. The arms are often sites of intense <a href="https://www.earth.com/news/fluffy-molecular-clouds-may-change-our-understanding-of-star-formation/" target="_blank" rel="noreferrer noopener">star formation</a>, where clouds of gas collapse to form new stars. 



In the center of a spiral galaxy lies a dense concentration of older stars and, often, a supermassive black hole.



<h2 class="wp-block-heading" id="h-structure-of-a-spiral-galaxy-nbsp">Structure of a spiral galaxy&nbsp;</h2>



The structure of a spiral galaxy is generally divided into three main components: the disk, the bulge, and the halo.&nbsp;



The disk is where the spiral arms are located and contains most of the galaxy's visible stars and interstellar medium.&nbsp;



The bulge is a tightly packed region of older stars at the core, and the halo consists of a sparse collection of stars and globular clusters that surround the galaxy.&nbsp;



Spiral galaxies can be classified into different types based on the tightness and number of their spiral arms, as well as the size of their central bulge.



<h2 class="wp-block-heading" id="h-the-milky-way-galaxy">The Milky Way galaxy</h2>



Our solar system is located within a large spiral galaxy known as the Milky Way. The name refers to its appearance as a dim, milky band of light stretching across the night sky.&nbsp;



The term "Milky Way" comes from ancient Greek mythology, where it was associated the goddess Hera's milk spilling into the sky. In Greek, it was called "Galaxias Kyklos," meaning "milky circle."&nbsp;



Spanning about 100,000 light-years in diameter, the Milky Way is composed of stars, gas, dust, and dark matter. The galaxy has a distinct disk shape with spiral arms that wind outward from a central bulge, which houses a supermassive <a href="https://www.earth.com/news/milky-ways-black-hole-unleashes-mysterious-flares/" target="_blank" rel="noreferrer noopener">black hole</a>. 



Our sun is located in one of the spiral arms - known as the Orion Arm - positioned roughly halfway from the center to the outer edge.&nbsp;



The Milky Way is part of a small group of galaxies called the Local Group, which includes the Andromeda Galaxy and several smaller galaxies.



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Hubble views a spiral galaxy with stellar explosions

A year‑long investigation following almost 20,000 adults has uncovered a clear link between getting to sleep early at night and doing more physical activity the following day. 



The recent <a href="https://www.pnas.org/doi/10.1073/pnas.2420846122" target="_blank" rel="noreferrer noopener">study</a>, reports that volunteers who habitually nodded off near 9 p.m. accumulated roughly 30 extra minutes of brisk movement each day compared with people who stayed awake until 1 a.m.



<a href="https://lens.monash.edu/@josh-leota" target="_blank" rel="noreferrer noopener">Dr. Josh Leota</a> of <a href="https://lens.monash.edu/@josh-leota" target="_blank" rel="noreferrer noopener">Monash University</a> led the project, working with colleagues across Australia, the United States, Switzerland, and the United Kingdom.



<h2 class="wp-block-heading" id="h-why-bedtime-matters">Why bedtime matters</h2>



Those <a href="https://www.earth.com/news/deep-sleep-during-naps-can-spark-insight-and-creativity/">early sleepers</a> also beat the sample average, clocking about 15 more minutes of moderate‑to‑vigorous physical activity <a href="https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2021.682233/full" target="_blank" rel="noreferrer noopener">(MVPA)</a> than peers who usually fell asleep around 11 p.m.



Public‑health agencies <a href="https://www.cdc.gov/physical-activity-basics/guidelines/adults.html" target="_blank" rel="noreferrer noopener">advise</a> adults to rack up at least 150 minutes of moderate effort each week, or about 30 minutes a day, meaning the extra half hour observed in the early‑to‑bed group can single‑handedly meet the daily target.



Crucially, the data show it is not just what time you fall asleep most nights, but whether you shift that time earlier while still getting your usual amount of shut‑eye. This combination produced the highest next‑day MVPA totals in the sample.



<h2 class="wp-block-heading" id="h-night-owls-under-pressure">Night owls under pressure</h2>



Your natural preference for early or late sleep, known as your <a href="https://www.sleepfoundation.org/how-sleep-works/chronotypes" target="_blank" rel="noreferrer noopener">chronotype</a>, is not merely a quirk of habit. Research using accelerometers has <a href="https://www.nature.com/articles/s41598-022-12267-5">linked</a> extreme evening chronotypes to more sedentary time and a higher ten‑year cardiovascular risk score in middle‑aged adults.



Another analysis of college students found that people who experience at least a two‑hour mismatch between work‑day and weekend sleep, known as <a href="https://pubmed.ncbi.nlm.nih.gov/39321660/" target="_blank" rel="noreferrer noopener">social jetlag</a>, were less likely to hit either aerobic or strength‑training recommendations.



“Standard 9‑to‑5 routines can clash with the natural sleep preferences of evening types, leading to social jetlag, <a href="https://www.earth.com/news/one-particular-sleep-stage-slow-wave-deep-is-most-important-for-preventing-dementia/">poorer sleep quality</a>, and increased daytime sleepiness, which can all reduce motivation and opportunity for physical activity the next day,” explained Dr. Leota.



<h2 class="wp-block-heading" id="h-activity-gadgets-that-never-sleep">Activity gadgets that never sleep</h2>



The Monash team relied on a wrist‑worn wearable sensor called <a href="https://www.whoop.com/us/en/" target="_blank" rel="noreferrer noopener">WHOOP</a> that logs heart rate, motion, and skin temperature every few seconds.



To confirm their findings, they repeated the analyses with almost 6,000 volunteers whose Fitbits fed data into the <a href="https://allofus.nih.gov/" target="_blank" rel="noreferrer noopener">U.S. All of Us Research Program</a>. The patterns held firm across age, gender, and ethnicity.



Earlier <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4341978/" target="_blank" rel="noreferrer noopener">work</a> has already shown that exercise and sleep travel a two‑way street: better sleep encourages movement, while regular movement deepens sleep quality.



<h2 class="wp-block-heading" id="h-work-schedules-make-it-worse">Work schedules make it worse</h2>



Evening‑type workers who are forced into early starts also face higher odds of metabolic trouble. Nurses who self‑identified as night owls had a 72 percent greater risk of developing diabetes than their early‑bird colleagues, although a healthier lifestyle cut that figure dramatically.



Adding vigorous workouts late in the evening can backfire too. An <a href="https://www.washingtonpost.com/wellness/2025/05/10/working-out-night-sleep-quality/" target="_blank" rel="noreferrer noopener">analysis</a> of 15,000 fitness‑tracker users found that strenuous activity inside the four‑hour window before bedtime delayed sleep onset by up to 80 minutes and severely reduced total sleep.



The <a href="https://www.who.int/initiatives/behealthy/physical-activity" target="_blank" rel="noreferrer noopener">World Health Organization</a> notes that exceeding the weekly activity minimum of up to 300 minutes of moderate effort, delivers extra <a href="https://www.earth.com/news/fitness-focused-medicine-physical-activity-reduces-chronic-disease-risk/">protection</a> against heart disease, depression, and several cancers. These benefits could be even easier to leverage if early sleep routines lead to increased daily activity.



<h2 class="wp-block-heading" id="h-small-sleep-tweaks-big-gains-in-activity">Small sleep tweaks, big gains in activity</h2>



Participants who advanced their bedtime by even 30 minutes, without shortening their total sleep, recorded noticeable lifts in activity the next morning.



“Our findings are consistent across different populations and show that if you can get to sleep earlier than usual whilst keeping your sleep duration the same, you may be more likely to increase your physical activity the following day,” said <a href="https://research.monash.edu/en/persons/elise-facer-childs">Dr. Elise Facer‑Childs</a>, senior author of the study. 



The pattern held regardless of age or fitness level, suggesting that a modest scheduling change is one lever almost anyone can pull.



If carving out time to exercise feels impossible, consider starting with the bedroom clock. An earlier lights‑out not only guards sleep duration but also builds momentum for next‑day <a href="https://www.earth.com/news/small-bursts-of-intense-exercise-can-slow-brain-aging/">activity</a>. 



This helps people reach or surpass the 150‑minute‑a‑week benchmark without adding another appointment to an already packed calendar.



<h2 class="wp-block-heading" id="h-how-earlier-bedtimes-may-help-fight-obesity">How earlier bedtimes may help fight obesity</h2>



Mounting research connects <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3632337/" target="_blank" rel="noreferrer noopener">obesity</a> with sleep habits, particularly the timing and quality of rest. People who sleep later are more likely to snack at night and less likely to engage in early‑morning activity, both of which can contribute to long‑term weight gain.



A 2020 <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7154640/" target="_blank" rel="noreferrer noopener">meta‑analysis</a> found that late bedtimes are linked to higher body mass index in both children and adults, even when total sleep time is adequate. Shifting sleep earlier may align eating patterns and activity schedules in a way that helps regulate metabolism and reduce excess fat storage.



The study is published in <a href="https://www.pnas.org/doi/10.1073/pnas.2420846122" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a>.



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Early sleep times linked to enhanced activity during the day

A year‑long investigation following almost 20,000 adults has uncovered a...

Tropical greenery once blanketed the supercontinent of Pangea, recycling carbon and regulating climate. Then, 252 million years ago, those forests collapsed - and with them, Earth’s primary brake on rising CO2.



A new study led by researchers at the <a href="https://www.leeds.ac.uk/">University of Leeds</a> and <a href="https://en.cug.edu.cn/">China University of Geosciences </a>shows that the disappearance of lush low-latitude vegetation after the <a href="https://www.earth.com/news/what-was-the-cause-of-earths-largest-mass-extinction/">Permian–Triassic Mass Extinction</a>. 



This collapse triggered a climate feedback so powerful that “super-greenhouse” conditions persisted for roughly five million years.



<h2 class="wp-block-heading" id="h-forest-loss-fueled-heat">Forest loss fueled heat</h2>



Scientists have long linked the “Great Dying” - in which more than 90 percent of marine species and around 70 percent of land vertebrates vanished - to colossal eruptions in Siberia.



Those outbursts released enough carbon dioxide to roast the planet. However, geologic evidence indicates that temperatures remained punishingly high long after the lava stopped flowing.



The missing piece, say the authors, is what happened to <a href="https://www.earth.com/news/tropical-forests-are-struggling-to-keep-pace-with-climate-change/">tropical forests</a> once temperatures and acid rain soared.



“Critically, this is the only high-temperature event in Earth’s history in which the tropical forest biosphere collapses, which drove our initial hypothesis,” explained Zhen Xu from the University of Leeds, who led the project.



“Now, after years of fieldwork, analysis, and simulations, we finally have the data which supports it.”



Using detailed fossil plant records from dozens of Chinese rock sections - among the most complete archives of the Permian–Triassic transition - Xu and colleagues reconstructed how photosynthetic productivity waxed and waned.



Their analysis dovetailed with climate-carbon cycle models, revealing that once the forests disappeared, natural <a href="https://www.earth.com/news/reducing-air-pollution-could-greatly-boost-carbon-sequestration-by-plants/">carbon sequestration</a> plunged. Without vegetation to absorb CO2, volcanic emissions lingered, intensifying heat and delaying Earth’s recovery.



<h2 class="wp-block-heading" id="h-fossils-reveal-sudden-earth-shift">Fossils reveal sudden Earth shift</h2>



China’s rugged outcrops hold a near-continuous record of sediment laid down across the extinction interval. Three generations of Chinese geologists have cataloged that history. 



Since 2016, Xu’s team has added thousands of new plant fossils and geochemical samples from across Earth. They trekked to sites reachable only by boat or horseback.



The resulting dataset captures a sharp, continent-wide shift from luxuriant, fern-rich swamp forests to sparse, shrubby landscapes within a geologic eye-blink.



Those observations fed into computer models developed at Leeds. By tweaking the fraction of global photosynthesis lost, Professor Benjamin Mills and Xu tested whether reduced carbon uptake alone could account for the five-million-year thermal plateau. The numbers lined up.



“There is a warning here about the importance of Earth’s present-day tropical forests,” Mills said.



“If rapid <a href="https://www.earth.com/news/global-warming-may-trigger-rapid-release-of-soil-carbon/">warming</a> causes them to collapse in a similar manner, then we should not expect our climate to cool to pre-industrial levels even if we stop emitting CO2," he said. "Indeed, warming could continue to accelerate in this case even if we reach zero human emissions.”



<h2 class="wp-block-heading" id="h-a-climate-tipping-point"><a></a>A climate tipping point</h2>



Because plants build their tissues out of atmospheric carbon, verdant ecosystems act as vast reservoirs, locking CO2 away in wood and soils. Destroy that biomass - through heat, drought, fire, or acid rain - and the storage vanishes.



The researchers argue the Permian event marks a clear instance of a climate–biosphere <a href="https://www.earth.com/news/climate-tipping-points-how-close-are-we-to-irreversible-change/">tipping point</a>. Falling forest cover triggered carbon feedbacks that locked the planet into a hotter state until vegetation slowly returned.



That idea dovetails with modern concerns. Today’s Amazon and Congo basins absorb billions of tons of CO2 annually, yet warming, deforestation, and <a href="https://www.earth.com/news/global-co2-emissions-from-forest-fires-have-surged-by-60-percent/">wildfires</a> are eroding their capacity. The ancient past shows how abruptly the system can flip.



<h2 class="wp-block-heading" id="h-old-rocks-new-warnings">Old rocks, new warnings</h2>



The study also illustrates how paleontology is evolving. Analyzing ancient crises now demands chemical tracers, numerical simulations, and high-resolution global mapping - tools far removed from the dusty image of fossil hunting.



“Paleontology needs to embrace new techniques - from numerical modeling to interdisciplinary collaboration - to decode the past and safeguard the future,” said co-author Hongfu Yin, a professor at the China University of Geosciences, who began collecting these Permian fossils decades ago.



“Let’s make sure our work transcends academia: it is a responsibility to all life on Earth, today and beyond. Earth’s story is still being written, and we all have a role in shaping its next chapter,” added co-author Jianxin Yu, a professor at the same university.



<h2 class="wp-block-heading" id="h-fossils-show-earth-s-tipping-point">Fossils show Earth’s tipping point</h2>



While humans are unlikely to unleash Siberian-scale lava floods, we are replicating the CO2 spike in real time. The Great Dying shows how ecosystem failure can prolong climatic damage far beyond the initial trigger.



In the Permian, recovery took millions of years; for modern civilization, even centuries of persistent warming would strain food supplies, economies, and <a href="https://www.earth.com/news/climate-action-and-biodiversity-striking-the-right-balance/">biodiversity</a>.



“The causes of such extreme warming during this event have been long discussed, as the level of warming is far beyond any other event,” Xu notes.



Her team’s evidence suggests that the planet’s thermostat can jam, and forests are a key component of the mechanism. Preserve them, and they buffer shocks. Lose them, and the heat may keep climbing long after emissions fall.



The ancient fossils of China thus deliver a double message: Earth has crossed tipping points before, and those thresholds hinge on living landscapes. Protecting today’s tropical forests might be the surest way to avoid replaying a five-million-year fever.



The study is published in the journal <a href="https://www.nature.com/articles/s41467-025-60396-y">Nature Communications</a>.



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Forest fossils from Earth’s largest mass extinction carry a climate warning

Tropical greenery once blanketed the supercontinent of Pangea, recycling carbon...

Apple,Cider,Vinegar,On,A,Metal,Spoon,Above,A,Glass

Every year, tens of millions of people around the world wrestle with bad moods and various levels of depression. Prescription drugs help many sufferers, yet side effects, cost, and uneven results often leave patients and clinicians on the lookout for other solutions. 



Then one day, as with all urban myths, one person told another who told another about a home remedy that never seems to fail. If you want to <a href="https://www.earth.com/news/is-depression-contagious-couples-may-share-it-through-kissing/">beat depression</a>, taking just one spoonful of vinegar every day will wash those blue away. 



When you stop and think about it for a minute, diet does seem like an obvious place to turn for cures to most any ailment. After all, the body and mind operate on what we feed them.



Could the same sour splash that wakes up a salad also nudge a weary mind toward optimism? 



Two small <a href="https://clinicaltrials.gov/study/NCT04706806" target="_blank" rel="noreferrer noopener">clinical trials suggests</a> that the idea of treating depression with a spoonful of vinegar is definitely worth more attention from medical professionals and the public.



<h2 class="wp-block-heading" id="h-studying-vinegars-impact-on-depression">Studying vinegars impact on depression</h2>



Fermented vinegars have had a place in folk remedies for centuries, prized for their ability to tame <a href="https://www.earth.com/news/drinking-this-amount-of-water-per-day-helps-control-blood-sugar-levels-in-people-with-diabetes/" target="_blank" rel="noreferrer noopener">blood sugar spikes</a> and add zest without salt or fat. 



Scientific studies over the past decade have confirmed some metabolic perks, yet mental health has been missing from the conversation. 



That gap inspired a team of nutrition researchers to see whether swallowing some vinegar on a regular schedule could ease depression by influencing mood-related chemistry as well as subjective feelings.



Led by <a href="https://www.asu.edu/" target="_blank" rel="noreferrer noopener">Arizona State University</a> dietitian Haley Barrong, the investigators recruited 28 overweight but otherwise healthy adults and randomly assigned them to one of two groups. 



Half drank two tablespoons of red wine vinegar diluted in water twice a day, while the rest swallowed a capsule containing only a trace of vinegar.



<h2 class="wp-block-heading" id="h-what-the-team-learned">What the team learned</h2>



Over four weeks, all participants completed the Center for Epidemiological Studies Depression questionnaire (<a href="https://nida.nih.gov/sites/default/files/Mental_HealthV.pdf" target="_blank" rel="noreferrer noopener">CES-D</a>) and the Patient Health Questionnaire-9 (<a href="https://med.stanford.edu/fastlab/research/imapp/msrs/_jcr_content/main/accordion/accordion_content3/download_256324296/file.res/PHQ9%20id%20date%2008.03.pdf" target="_blank" rel="noreferrer noopener">PHQ-9</a>).



Scores on the CES-D hardly budged, yet the PHQ-9 told another story. In the vinegar group, reported depressive symptoms fell by an average of 42 percent, compared with an 18 percent dip in the pill group. 



After reviewing the data, the authors wrote, “This data provides additional support that daily vinegar ingestion over four weeks can improve self-reported depression symptomology in generally healthy adults and that alterations in [<a href="https://www.earth.com/news/vitamin-b-paradox-supplement-linked-to-heart-disease-risk/" target="_blank" rel="noreferrer noopener">vitamin B3</a>] metabolism may factor into this improvement.”



<h2 class="wp-block-heading" id="h-vinegar-depression-and-blood">Vinegar, depression, and blood</h2>



The team also collected blood samples to watch biochemical pathways at work. The most striking change was an 86 percent surge in nicotinamide, a form of vitamin B3 that feeds into the NAD⁺ salvage pathway responsible for cellular energy recycling. 



Higher nicotinamide aligns with lower inflammation, a relationship that has caught psychiatric interest before. 



Two metabolites - <a href="https://www.earth.com/news/eating-less-of-this-amino-acid-isoleucine-boosts-lifespan-in-mice-an-average-of-33-percent/">isoleucine</a>, a branched-chain amino acid, and <a href="https://pubchem.ncbi.nlm.nih.gov/compound/Isobutyric-acid" target="_blank" rel="noreferrer noopener">isobutyric acid</a> - shifted as well, hinting that vinegar tweaks broader metabolic networks tied to mood regulation.



“Depressive disorders are the most prevalent mental health conditions in the world,” write the researchers. 



“The commonly prescribed antidepressant medications can have serious side effects, and their efficacy varies widely. Thus, simple, effective adjunct therapies are needed.”



<h2 class="wp-block-heading" id="h-how-vinegar-might-lift-mood">How vinegar might lift mood</h2>



Several mechanisms could explain the modest improvements. Acetic acid, the defining ingredient in vinegar, activates AMP-activated <a href="https://www.earth.com/news/studies-learn-the-exact-amount-of-time-you-should-spend-training-to-build-muscle/">protein kinase</a>, an energy sensor linked to <a href="https://pubmed.ncbi.nlm.nih.gov/25308486/" target="_blank" rel="noreferrer noopener">NAD⁺ production</a>. 



More NAD⁺ means brain cells repair DNA damage more effectively and maintain healthy mitochondria. 



Another possibility involves the gut. <a href="https://www.earth.com/news/scientifically-proven-tips-for-better-kombucha-brewing/">Acetic acid</a> can encourage growth of friendly bacteria that generate neurotransmitter precursors, forging a gut-brain feedback loop many neuroscientists now consider crucial to emotional balance.



Lab work in mice has already shown that boosting NAD⁺ protects neurons from stress hormones, while human studies connect higher dietary vitamin B3 with lower depression risk. 



The present human trial knits those ideas together: swallow vinegar, raise nicotinamide levels, and perhaps give the brain an energetic lift.



<h2 class="wp-block-heading" id="h-depression-vinegar-and-health">Depression, vinegar, and health</h2>



None of this turns vinegar into a standalone treatment. The experiment lasted only a month, involved people with mild symptoms, and lost some statistical punch after adjusting for baseline scores. 



Still, swallowing a familiar pantry staple twice a day costs pennies and carries few risks for most adults. 



“Future research examining the effects of vinegar administration in clinically depressed or at-risk populations, and those on antidepressant medications, is warranted," the authors concluded.



“A focus on mechanisms and large patient samples will strengthen the science and provide the evidence to more firmly demonstrate vinegar's role in health promotion.” 



Until those larger trials wrap up, dietitians may simply remind clients that incorporating two tablespoons of red wine or apple cider vinegar into meals is safe for most, provided they dilute it and protect their teeth by rinsing with water.



<h2 class="wp-block-heading" id="h-future-studies-on-depression-and-vinegar">Future studies on depression and vinegar</h2>



People interested in trying the routine might start by whisking vinegar into dressings or stirring it into a tall glass of water before lunch and dinner. 



Anyone with <a href="https://www.earth.com/news/junk-food-diet-triggers-lasting-changes-in-the-brain/">acid reflux</a>, kidney issues, or current prescriptions should check with a clinician first. 



<a href="https://www.earth.com/news/how-nature-heals-outdoor-activities-greatly-improve-mental-health/">Mental health</a> professionals could eventually blend such low-cost dietary tweaks with therapy and medication, tailoring care to each person’s biology and preferences.



The notion that mood can shift alongside something as ordinary as a mealtime condiment highlights how tightly body and mind intertwine.



Vinegar will never replace professional treatment, yet its potential to turn that frown upside down - especially for those reluctant to take pharmaceuticals - deserves the careful follow-up studies that this research team calls for. 



The full study was published in the journal <a href="https://www.mdpi.com/2072-6643/16/14/2305" target="_blank" rel="noreferrer noopener">Nutrients</a>.



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Study identifies a much easier and cheaper way to treat depression than with prescription drugs

Every year, tens of millions of people around the world...

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