Over the past 12 months, scientists have captured stunning images of the planets, a galaxy, a planetary nebula and more from space.
This composite image provided by NASA shows before and after images taken by the Opportunity rover. At left is an image of a patch of ground taken on Dec. 26, 2013. At right is in image taken on Jan. 8, 2014 showing a rock shaped like a jelly doughnut that had not been there before. The space agency said the rover Opportunity likely kicked up the rock into its field of view. Opportunity landed on Mars in 2004 and continues to explore. NASA/AP