Gamma-ray bursts are not only incredible to study, but their discovery has an epic story all its own. Today Phil takes you through some Cold War history and then dives into what we know.
Today on Crash Course Astronomy, Phil dives into some very dark matters.
Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING!
Most of the universe is made up of a mysterious entity that pervades space: dark energy.
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