Sign in
Deep TimeCosmos & Earth

Light breaks free (cosmic background)

13.8 billion years agoNotable

About 380,000 years after the Big Bang, atoms form and light travels freely. We still detect this glow today.

Community notes

Loading notes…

Learn more ranked by votes

BookSteven Weinberg
The First Three Minutes ↗
Editor's pick
BookGeorge Smoot and Keay Davidson
Wrinkles in Time ↗
Editor's pick
VideoSearch on YouTube
cosmic microwave background explained ↗
Editor's pick