There is a large suite of scientific evidence that supports the picture of the expanding Universe and the Big Bang. But whether the Universe is finite or infinite is still not yet decided. Image credit: NASA / GSFC.

Ask Ethan: How Do We Know Space Is Expanding?

The Universe may defy our intuition, but that’s what science is for!

If you take a look out at the Universe, and in every direction you look, you see objects rushing away from you, what would you conclude? Would it be that you’re a repellant, somehow? That the fabric of space itself is expanding? That you’re at the center of an earlier…