Astronomy games
Nineteen interactive mini-games to build intuition for orbits, lunar phases, tides, spectra and celestial navigation.
Orbit Balancer
Drag a planet around a star and give it just the right velocity for a stable orbit — not too fast, not too slow.
02Mini-gamesStar Sorter
Place real stars on the Hertzsprung–Russell diagram by temperature and luminosity.
03Mini-gamesRedshift Runner
Estimate the redshift of a galaxy by sliding the spectral template until its lines match the observed spectrum.
04Mini-gamesSky Navigator
Find Polaris, pick out circumpolar constellations and read your latitude and longitude from the sky.
05Mini-gamesMoon Phase Matcher
Drag the Moon around Earth until its lit half shows the target phase — and learn where each phase sits relative to the Sun.
06Mini-gamesConstellation Builder
Connect the stars in the right order to draw Orion, Ursa Major and Cassiopeia.
07Mini-gamesGravity Assist
Slingshot a probe around Jupiter so a free gravity assist carries it out to Saturn.
08Mini-gamesRetrograde Race
Watch Mars trace its sky loop and call the exact moment it starts moving backward.
09Mini-gamesEscape Velocity
Pick the launch speed that lets a rocket barely escape each planet — from the Moon to a neutron star.
10Mini-gamesLight-Time Courier
Fire light signals at moving planets, leading each target because light takes minutes to hours to arrive.
11Mini-gamesDoppler Detective
Read a star's wobbling spectral lines to measure its radial-velocity curve and uncover the orbiting planet.
12Mini-gamesHabitable Zone
Place each planet at the distance where liquid water can survive around its star.
13Mini-gamesTidal Tug
Arrange the Sun and Moon around Earth to forecast the height of the tide.
14Mini-gamesMass Sorter
Sort celestial bodies from lightest to heaviest — and learn that size has nothing to do with mass.
15Mini-gamesTelescope Zoom
Match each target to the smallest instrument that can see it, from naked eye to space telescope.
16Mini-gamesEclipse Predictor
Slide through the year and predict which days bring solar or lunar eclipses.
17Mini-gamesSpacetime Bend
Drag a black hole to bend a light ray onto the detector — and line it up perfectly for an Einstein ring.
18Mini-gamesSpectral Fingerprints
Identify which elements left their line fingerprints in a spectrum — then spot which way the whole pattern shifted.
19Mini-gamesCrater Counter
Count craters and compare surfaces to date terrains — the more cratered ground is the older one.
Games run entirely in your browser — no sign-in, no data sent to a server.