Crash Course Astronomy | Galaxies, part 1: Crash Course Astronomy #38 | Episode 38 | PBS
By Owner - Crash Course Astronomy - Powered By PBSFrom Pbs OrgSeptember 6, 2025
Galaxies contain gas, dust, and billions of stars or more. They come in four main shapes: elliptical, spiral, peculiar, and irregular. Galaxies can collide, and grow in size by eating each other.