We live in a Universe full of galaxies, supermassive black holes, and violence. The violence is particularly relevant here, because every so often, these galaxies merge, and if they each contain a supermassive black hole, the gravitational wave "ripples" that get sent through space will literally shake and affect everything that's in them.

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J Westphal Caltech , Sabine Hossenfelder , K Noll Stsc , Stony Brook University , A Evans University Of Virginia , Hubble Heritage Team Stsc , Hubble Heritage Team , Hubble Collaboration , Parkes Pulsar Timing Array , Starts With ,