Our galaxy is amazing, but it’s not the only one. Astronomers think there could be two trillion others out there. So, what’s up with those other galaxies? Are they just standing still, or do they orbit something? We asked astrophysicist Ian Hall to help us find the answer.
Got a question that’s circling around in your brain? Send it to us at BrainsOn.org/contact, and we’ll help find a universally appealing answer!

We’re back! Brains On Universe has a new headquarters
07:30

A big update about Moment of Um and the Brains On Universe
02:56

How do braces work?
06:19