How do we know the universe is ever expanding?
In: Physics
So this guy named Hubble did a whole bunch of measurements of distant stars and galaxies including how far they are form us and how fast they’re moving. Okay, that’s not exactly true, a bunch of the velocity measurements came from a guy named Slipher. When you look at the data he collected you see [this relationship](https://www.pnas.org/content/pnas/112/11/3173/F1.medium.gif). That graph shows that the further something is from us, the faster it’s moving away from us. There’s really no special magic here. It’s just a matter of measuring the data and looking at it.
Also, the guy that found this out? He got a fancy telescope named after him. You’ve probably heard of it. Unfortunately, there’s not also a Slipher telescope.
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