Crash Course Astronomy
Galaxies, part 1: Crash Course Astronomy #38
Galaxies contain gas, dust, and billions of stars or more.
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Crash Course Astronomy
Galaxies, part 2: Crash Course Astronomy #39
Active galaxies pour out lots of energy.
Crash Course Astronomy
Gamma-Ray Bursts: Crash Course Astronomy #40
The discovery of gamma-ray bursts is an epic story.
Crash Course Astronomy
Dark Matter: Crash Course Astronomy #41
Today on Crash Course Astronomy, Phil dives into some very dark matters.
Crash Course Astronomy
The Big Bang, Cosmology part 1: Crash Course Astronomy #42
Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING!