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World 4 · The First Light · 12 min · PRO

Ripples: tiny differences that became galaxies

Why the sky's oldest light is not quite smooth

PRO · Cosmos: Big Bang to Now

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.

  • A hot, glowing young universe: recombination
  • Penzias, Wilson and the hum in the antenna
  • Reading the cosmic recipe: 5%, 27%, 68%
  • Orbits in a galaxy: how Kepler predicts the speeds
  • Rubin's flat curves
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