World 4 · The Goldilocks Zone · 11 min · PRO
Stars come in many sizes
Where the zone sits around G, K and M stars
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.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly