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World 5 · Reading an Alien Sky · 11 min · PRO

A thin ring of air in the dip

Transmission spectroscopy

PRO · Exoplanet Hunter

World 5: Reading an Alien Sky 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.

  • Fingerprints in the spectrum
  • Catching a planet’s heat
  • Signs of life? Handle with care
  • A tiny star with seven worlds
  • A system inside Mercury’s orbit
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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

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