Alex Filippenko: Supernovae, Dark Energy, Aliens & the Expanding Universe | Lex Fridman Podcast #137

ℹ️ EPISODE INFO

Released

November 8, 2020

Duration

2h 35m

Channel

Lex Fridman Podcast

Watch on YouTube

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📝 EPISODE DESCRIPTION

Alex Filippenko is an astrophysicist and professor of astronomy at Berkeley. Please support this podcast by checking out our sponsors:

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EPISODE LINKS: Alex's Website: https://astro.berkeley.edu/people/alex-filippenko/ PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ Full episodes playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOdP_8GztsuKi9nrraNbKKp4 Clips playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOeciFP3CBCIEElOJeitOr41 OUTLINE: 0:00 - Introduction 2:08 - Universe expansion 3:32 - Dark energy 11:00 - Scientific revolutions 22:50 - Asteroid hitting Earth 26:22 - Giant solar flares and the power grid 33:22 - Elon Musk and space exploration 38:13 - Exoplanets 45:35 - Traveling close to the speed of light 47:45 - Traveling faster than the speed of light 56:11 - Intelligent life in the universe 59:46 - Fermi Paradox 1:09:24 - Finding alien life would be bad news 1:14:20 - UFO sightings 1:27:30 - Universe expansion speed 1:32:14 - The universe is infinite 1:36:30 - What happened before the Big Bang? 1:40:46 - Roger Penrose 1:44:20 - Nobel Prize for the accelerating universe 2:05:55 - Supernova 2:17:19 - The greatest story ever told 2:21:16 - Richard Feynman 2:28:09 - Meaning of life CONNECT:

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🎤 SPEAKERS

• Lex Fridman

  host

• Alex Filippenko

  guest

🧾 EPISODE SUMMARY

In this episode of Lex Fridman Podcast, featuring Lex Fridman and Alex Filippenko, Alex Filippenko: Supernovae, Dark Energy, Aliens & the Expanding Universe | Lex Fridman Podcast #137 explores supernovae, dark energy, and our fragile future in a vast cosmos Lex Fridman and astrophysicist Alex Filippenko explore the fate of the universe, the discovery of cosmic acceleration, and the mystery of dark energy and dark matter. Filippenko recounts how Type Ia supernovae revealed that the universe’s expansion is speeding up, and why dark energy might be vacuum energy or an evolving field, while admitting we still lack a fundamental physical explanation. They discuss existential risks from space (asteroids, comets, solar flares, supervolcanoes), the practicality and limits of human and robotic space travel, and the likelihood and detectability of extraterrestrial intelligence. Throughout, Filippenko emphasizes scientific humility, the interplay of data and theory, and the “greatest story ever told”: that we are literal star-stuff, a universe that became conscious enough to study itself.

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