Universe Scale: Science Videos

This series explores the scale of the universe, from the tiniest particles to the largest galaxies. You will learn how big the Earth, sun, solar system, and galaxy really are. You will also learn how the universe began with the Big Bang, how we know it is expanding, and what the cosmic background radiation tells us. These videos will change how you see your place in the cosmos.

Note: All Khan Academy content is available for free at www.khanacademy.org