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

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.

NASA’s Chandra X-Ray Observatory, however, has been taking images for decades — long enough to compile timelapses that show the movement of deep space objects. And the team has just released two such “movies,” one of the iconic Crab Nebula and one of Cassiopeia A (Cas A).

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