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World 5 · Reading an Alien Sky · 12 min · PRO

Signs of life? Handle with care

Biosignatures and false positives

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.

  • A thin ring of air in the dip
  • Fingerprints in the spectrum
  • Catching a planet’s heat
  • 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

Unlock Exoplanet HunterTry the free world
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