The short clip compresses 25 minutes of images taken by the Philae Lander as it came to rest on the surface of Comet 67P/Churyumov–Gerasimenko. There is more going on in the image than you would think. Much of the dust that appears to be falling straight down are actually stars moving as 67P rotates. The dust that is actually moving in the image travels in all directions and mostly upward.
Image by @landru79 (who just won the internet). Be sure to see this page on LiveScience that explains how the clip was made and also includes an animation isolating the stars so you can see what is actually moving on the surface.