Astronomers are studying two black holes currently orbiting each other at about the width of our solar system.
That's pretty close together for really big black holes. They're hoping that they'll crash into each other.
Why? Because the sheer energy created by the collision might bend space and time, creating detectable effects that might teach us something about the nature of the universe.
Or maybe it will open a huge crack and something nasty will come through it. A bad wolf, maybe?