The Largest Centaurs
Simulates the eight largest centaurs, including ringed Chariklo and Chiron, crossing among Jupiter, Saturn, Uranus, and Neptune on short-lived planet-crossing orbits.
All Scenarios
Browse every interactive 3D gravity simulation — from NASA exoplanet systems and JPL Horizons Solar System models to n-body choreographies, spacecraft trajectories, and hypothetical what-if experiments. All run on Newtonian n-body physics.
The Largest Near-Earth Asteroids
Simulates the ten largest near-Earth asteroids — from 34 km Ganymed to Toutatis — on planet-crossing paths among Mercury, Venus, Earth, and Mars.
The Limits of Earth's Sphere of Influence
Simulates ring particles at the edge of Earth’s sphere of influence (~925,000 km) versus an inner band at lunar distance, showing where solar gravity overtakes Earth’s.
The Moon Falls into Earth
Simulates the Moon starting just outside Earth with sub-orbital speed, so gravity pulls it in to overlap Earth’s sphere before a full merger in the real Sun–Earth system.
The Sleeping Snow Man
Simulates three equal masses on a choreography shaped like a sleeping snowman: two stacked loops with a smaller head. Each mass traces the same curve, offset in phase from the others.
The Solar System
Simulates the eight major planets around the Sun on JPL Horizons orbits for 1 January 2025. No moons, asteroids, or dwarf planets — just the Keplerian planetary architecture.
The Solar System with a Hot Jupiter
Simulates the real 1 January 2025 Solar System plus a Jupiter-mass planet on a 4-day, 0.05 AU orbit inside Mercury — a hot Jupiter our system never formed.
The Star of David N-body Choreography
Simulates six equal masses tracing a Star of David — two overlapping triangles. Each body follows the same closed curve, offset by one-sixth of a period from its neighbors.
TrES-1 - System
Simulates TrES-1, a Sun-like G-type star of 1.04 solar masses, and TrES-1 b, a 0.84-Jupiter-mass companion, with an orbital period of 3.0 days.
TrES-2 - System
Simulates TrES-2 b, the darkest known exoplanet. It reflects less than one percent of incoming light, darker than coal, despite being a hot Jupiter. Kepler later refined that coal-dark albedo.
TrES-3 - System
Simulates TrES-3, a Sun-like G-type star of 0.93 solar masses, and TrES-3 b, a 1.91-Jupiter-mass companion, with an orbital period of 1.3 days, at 0.023 AU from its star.
TrES-4 - System
Simulates TrES-4, a Sun-like F-type star of 1.08 solar masses, and TrES-4 b, a 0.78-Jupiter-mass companion, with an orbital period of 3.6 days.
TrES-5 - System
Simulates TrES-5, an orange K-type dwarf of 0.90 solar masses, and TrES-5 b, a 1.79-Jupiter-mass companion, with an orbital period of 1.5 days, at 0.025 AU from its star, and an equilibrium temperature near 1,480 K.
Triangle
Simulates four masses in a triangular choreography: three bodies loop at the vertices while a fourth completes the periodic pattern, combining triangular symmetry with small ellipses.
Triton Capture by Neptune
Simulates Agnor & Hamilton’s binary-exchange capture of Triton by Neptune: an equal-mass Triton binary on a close encounter that binds one member and ejects the other.
Twin Jupiters
Simulates two Jupiter-mass giants at 3 AU and 4 AU instead of one Jupiter, with the terrestrial planets and outer giants in their real 1 January 2025 positions.
UCAC3 113-933 - System
Simulates UCAC3 113-933, a cool M-dwarf of 0.61 solar masses, and UCAC3 113-933 b, a 21.0-Jupiter-mass companion, at 6,100 AU from its star.
UCAC4 328-061594 - System
Simulates UCAC4 328-061594, a Sun-like G-type star of 1.19 solar masses, and UCAC4 328-061594 b, a 21.0-Jupiter-mass companion, at 19,000 AU from its star.