Dear Hank & John Introducing The Universe
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May 22, 2024 Theoretical astrophysicist Katie Mack joins John Green to discuss the Big Bang, cosmic dawn, black holes, and the eventual end of our universe. They explore the mystery of matter-antimatter imbalance, the early universe and cosmic inflation, the formation of elements, and the profound meaning of the universe.
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Big Bang Theory Explained
- The Big Bang theory describes a hot, dense early universe that has expanded and cooled since.
- It doesn't refer to an explosion from a single point, but a uniform expansion.
Evidence for Universe Expansion
- The expansion of the universe is supported by observations of distant galaxies moving away.
- The light from these galaxies stretches, shifting towards the red end of the spectrum.
Infinite Universe
- The universe may be infinitely large, and it might have always been infinite.
- The current universe could just be less hot and less dense than the early universe.