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Crash Course Pods: The Universe

Ep. 7: What’s Keeping the Stars Apart

Jul 17, 2024
Astrophysicist Katie Mack and podcast host John Green discuss dark energy keeping stars apart. They explore cosmic noon, redshift, galaxy collisions, dark matter, and the universe's accelerating expansion due to dark energy. They delve into the mysteries of fundamental constants, Hubble Tension, and the poetic side of astrophysics.
01:00:14

Podcast summary created with Snipd AI

Quick takeaways

  • Dark energy drives accelerated universe expansion, contradicting gravity’s expected slowdown effect.
  • Redshift data from distant supernovae helps map out expansion history and reveal unexpected universe acceleration.

Deep dives

The Concept of Cosmic Noon and the Accelerated Expansion of the Universe

Cosmic noon marks the period in the universe's history where star formation peaks, galaxies merge, and stars are rapidly formed. This phase involves a mysterious cosmic wind that triggers the accelerated expansion of the universe, potentially linked to what Einstein termed the cosmological constant. The discussion delves into how gravity pulls matter together to form stars, galaxies, and galactic structures, while the expanding universe creates more space between these structures, leading to a delicate balance that determines the pace of star and galaxy formation.

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