What is Rotating (Kerr)?

A rotating black hole, or Kerr black hole, is like a spinning top that’s so strong it can twist space and time around it.

Imagine you have a super fast merry-go-round, not just for kids, but one that spins faster than anything you’ve ever seen. Now imagine instead of kids, this merry-go-round is made of gravity itself. That's what a Kerr black hole is like: a spinning version of a regular black hole.

Just like how you can make a merry-go-round go faster by pushing it, a black hole can start spinning if it swallows something that’s already moving, like a star or another black hole. The more it eats, the faster it spins.

When something spins really fast, it doesn’t just move in one direction, it kind of tugs at everything around it. A Kerr black hole tugs so strongly that even light can get twisted around it, like a toy train going around a loop-de-loop.

So while a regular black hole is more like a deep pit you fall into, a rotating black hole is like a spinning whirlpool, fun, fast, and full of twists!