Watch 2 gorgeous supernova remnants evolve over 20 years (timelapse video)

A blue and white glowing view of the Crab Nebula. It looks like there's a ring of gassy material around a dot that's giving off a stream of gas itself.

When we picture what's in deep space, we often think of static images — colorful composites of distant objects like nebulas and galaxies, frozen in time. The reality is that everything is moving, and it's moving fast. But given the vast distances involved, it's hard for us to see that motion.