A hot, glowing young universe: recombination

World 4: The First Light is part of PRO

The first world of Cosmos: Big Bang to Now is free. PRO opens the other 25 lessons in 6 worlds — simulations, quizzes and all.

• 🔒 Penzias, Wilson and the hum in the antenna
• 🔒 Ripples: tiny differences that became galaxies
• 🔒 Reading the cosmic recipe: 5%, 27%, 68%
• 🔒 Orbits in a galaxy: how Kepler predicts the speeds
• 🔒 Rubin's flat curves

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly