Expanding black holes could be playing Pac Man with the universe

Pac Man‘s a simple protagonist. He doesn’t have a scruffy beard or a worried look in his eyes. He’s doesn’t sling out quips or one-liners. He eats dots. That’s it. That’s sort of how black holes work. They only do one thing: gobble up literally everything. But, just like Pac Man, they can only eat the stuff that’s right next to them. Black holes and stars collide often and, usually, this results in cosmic mergers. Basically, the black hole eats the star or the star becomes a black hole and merges with the other black hole to form a single,…

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