This is Comet Pan-STARRS as seen by the NASA STEREO-B spacecraft. The movie runs from March 10-12, 2013 with approx two frames per hour.
In the very upper-right corner, the bright planet is actually Earth itself! (STEREO is on the opposite side of the Sun, looking back at both us and the comet). The Sun is out of of the field of view, off to the upper-left, and the dots you see across most of the image are stars.
The movie is black and white because it's a kind of "difference" movie -- one where we subtract the previous frame from the current one in order to enhance structures that are in motion (like the comet).
