2min chapter

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#257 – Brian Keating: Cosmology, Astrophysics, Aliens & Losing the Nobel Prize

Lex Fridman Podcast

CHAPTER

How Old Is the Universe?

The most important number in cosmology is called the Hubble constant. It's a speed per distance, which means you multiply it by distance and you get a speed. While you're measuring the speed of a distant galaxy at many megaparsig away, this isn't actually strictly true because of local gravitational effects. We know how fast are moving away. That's where you get that number from.

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