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World 4 · The Goldilocks Zone · 12 min · PRO

The temperature of a bare rock

Equilibrium temperature, albedo and greenhouse

PRO · Exoplanet Hunter

World 4: The Goldilocks Zone is part of PRO

The first world of Exoplanet Hunter is free. PRO opens the other 26 lessons in 6 worlds — simulations, quizzes and all.

  • How much light does a planet get?
  • Stars come in many sizes
  • What the zone does not promise
  • A thin ring of air in the dip
  • Fingerprints in the spectrum
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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