On Tuesday, Scott J. Kelly is scheduled to return from the International Space Station, completing the longest stay in space for a NASA astronaut. (Photo: NASA)
In 1054 AD, Chinese astronomers were startled by the appearance of a new star, so bright it could be seen in broad daylight for several weeks. Today, the Crab Nebula is what's left of the supernova explosion they witnessed.
NGC 7635: The Bubble Nebula
Carina nebula mountaintop. A wall of space images could be amazing.
A Cosmic Holiday Ornament, Hubble-Style by NASA Goddard Photo and Video, via Flickr