Cosmic microwave background
The faint afterglow of the Big Bang, providing crucial information about the early universe's composition and structure.
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Videos Mentioning Cosmic microwave background

Brian Keating: Cosmology, Astrophysics, Aliens & Losing the Nobel Prize | Lex Fridman Podcast #257
Lex Fridman
A faint glow of radiation filling the universe, discovered serendipitously, which is the afterglow of the Big Bang and a key target for BICEP experiments.

Dark matter: the next frontier – Public lecture by Dr. David E. Kaplan
Fermilab
The faint afterglow of the Big Bang, providing crucial information about the early universe's composition and structure.

At the edge of time: Exploring the mysteries of our universe’s first seconds
Fermilab

How good is the evidence for Dark Energy?
Sabine Hossenfelder
Ancient light from the universe used to study anisotropy, specifically noting a pronounced dipole.

Roger Penrose: Physics of Consciousness and the Infinite Universe | Lex Fridman Podcast #85
Lex Fridman
Relic radiation from the early universe, strong evidence for the Big Bang theory.

We Found Galaxies Too Old for the Universe
PBS Space Time
The remnant radiation from the early universe, which shows tiny density fluctuations that seeded the formation of galaxies.