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Crash Course Astronomy
Dark Energy, Cosmology part 2: Crash Course Astronomy #43
Most of the universe is made up of a mysterious entity that pervades space: dark energy.
Galaxies, part 2: Crash Course Astronomy #39
Welcome to school without the classroom! Join host Phil Plait and discover everything there is to know about the cosmos.
Galaxies, part 2: Crash Course Astronomy #39
Season 1 Episode 39 | 15m 20s
Active galaxies pour out lots of energy, due to their central supermassive black holes gobbling down matter. Galaxies tend not to be loners, but instead exist in smaller groups and larger clusters. Our Milky Way is part of the Local Group, and will one day collide with the Andromeda galaxy.
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