Now, while a lot of smaller black holes enjoy spending time
by themselves, others can be a bit more ... social! To be specific, black holes
often love to dance with other objects in the universe.
Sometimes, the dance begins with two stars, long before the
black hole is even part of the picture. Then, one day, one of the two stars
goes supernova, and … pop! The dance continues, but with a new partner.
Other times, when another massive object – like a star – happens to pass by a black hole, it, and the
black hole, can't help but dance together!
In either case, the black hole could even pull stuff off of its
new friend to make a fancy accretion disk.
Look at it go!
And while these first two black holes have been paired up
with stars, there are a quite a few other potential dance partners out there in
the universe. Smaller black holes have a great time dancing with low-mass
stars, high-mass stars, white dwarfs, neutron stars, unicorns … wait, what?
Off you go, then! Shoo!
Ahem. Anyway, they can also dance with other black holes, including
really, really big ones.
And sometimes, when they're dancing with a giant star, that
giant star can go supernova, eventually producing another neutron star, or ... voila!
A second black hole! And, if either of those two get a bit too close to the
other black hole ... You could get a new, larger, single black hole!
By the way, did you hear that? When two black holes collide,
they also produce a ton of energy as ripples in space-time, and, if we have the
right tools, we can actually listen to them! Amazing.
Well, there you have it! Now grab your telescopes, get out there, and dance the night away!