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World 2 · The Expanding Universe · 11 min · PRO

No centre, no edge: the raisin-bread universe

Expansion is the stretching of space itself

PRO · Cosmos: Big Bang to Now

World 2: The Expanding Universe 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.

  • The scale factor: a ruler that stretches
  • The age of the universe: running the film backwards
  • Accelerating: dark energy
  • Stretched light: Doppler vs cosmological redshift
  • Reading redshift in a spectrum
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  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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← The observable universe: how far can we see?The scale factor: a ruler that stretches →

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