Sheridan Glacier in Alaska

Today's Image of the Day from NASA features Sheridan Glacier, a lake-calving glacier in southeastern Alaska. Operation IceBridge is a NASA mission that recently completed 11 years of polar surveys.  The airborne mission was developed to monitor the fluctuations of ice sheets and glaciers, along with their contribution to sea level rise.  --- By Chrissy Sexton, Earth.com Staff Writer Image Credit: NASA/UAF/Martin Truffer