Simulate gravity
N-body simulation at almost any speed using Newtonian mechanics.
Real science, real physics,no supercomputer required.

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Collide Planets & Stars


Epic, mind blowing collisions of massive planetary bodies.

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Model Earth's Climate
Watch sea ice grow and recede with
the seasons because of the
tilt of the Earth: change the tilt
and change the seasons.
Or move the Earth farther from the
Sun and freeze the entire planet.
Learn more

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Terraform Planets
Add carbon dioxide to a planet's
atmosphere to heat it up.
Then add water...

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Deform Surfaces
Impact planets with asteroids and comets and leave behind massive, molten craters.

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Supernova a Star
Make a star evolve by cranking up its age or mass, then watch a supernova unfold.

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And more...
Historical simulations - ride along with Juno, New Horizons, & other spacecraft
Material system - build planets out of hydrogen, iron, rock, & water
Solar flares & volatile trails
Procedurally generated
stars and planets
Pulsars
Light-warping black holes
Dark matter

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