Light that stretches and squeezes

World 3: The Wobbling Star 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.

• 🔒 Planets tug back
• 🔒 Reading the velocity curve
• 🔒 Mass plus radius gives density
• 🔒 How much light does a planet get?
• 🔒 Stars come in many sizes

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