How do we spot asteroids that are too close to Earth?
Today’s Video of the Day comes from NASA JPL and features a look at how scientists spot asteroids that are too close to Earth.
NASA survey telescopes regularly scan the sky, and when they detect a moving object, they check it with the preexisting database of known space objects. If there is no match in the database, the object is given further review. If the object is closer to Earth, it is given a higher priority in the queue.
Video Credit: NASA JPL