Games
Short astronomy games built on real physics and real measurements. Free, no accounts, no ads, and nothing tracks you.
All nine games, one campaign
Your star system
Every game you win adds a piece to a star system that is yours: a star, worlds, moons, a probe, a comet. Win one to light up the first piece.0 of 9 missionsOpen your systemSlingshot
Launch a probe through real gravity: orbits, escape velocity, gravity assists.The Solar SystemGrades 6-1240 minMoon Phases
Move the Moon around Earth: phases, waxing and waning, and eclipses.The Solar SystemGrades 6-1230 minStellar Forge
Forge stars of any mass and watch them live and die: white dwarfs, supernovae, black holes.StarsGrades 6-1230 minPlanet Hunter
Find exoplanets in starlight: dips, periods, sizes and impostors.ExoplanetsGrades 6-1235 minGoldilocks
Find the habitable zone around real stars and sort real exoplanets.AstrobiologyGrades 6-1230 minScale Run
Estimate cosmic distances, from the Moon to the edge of the observable universe.The Solar SystemGrades 6-1230 minCosmic Timeline
Order the history of the universe, from the Big Bang to the last black holes.CosmologyGrades 6-1235 minRedshift Lab
Measure real galaxy redshifts, fit the Hubble constant, find the age of the universe.CosmologyGrades 6-1235 minOrbit Quiz
Ten questions every Monday, drawn from the week’s space news and our guides.CosmologyGrades 6-1225 min