Free · How far is far?

Exoplanet Distance Race for Kids

Race two faraway worlds and see how many years even light would need to reach them.

  • Clear, kid-friendly steps
  • Private in your browser
  • No signup

Worlds beyond our Sun

Pick a planet to explore

Light-speed race

Which world is closer?

Proxima Centauri b4.2 years at light speed
Kepler-452 b1,402 years at light speed

Even light—the fastest thing we know—would need years to reach either world.

Powered by Open Exoplanet Catalogue (curated subset), an open-source library available under MIT.

Three simple steps

How to use it

  1. Pick a real planet that circles a star beyond our Sun.
  2. Compare its size, year, heat, distance, or discovery date.
  3. Try another world and see how different it can be.

Private by default

Your words and choices stay in this browser tab. There are no accounts, uploads, ads, or trackers inside the tool. Close the tab and the working data is gone.