Planet Crash Sandbox

A whole solar system to play with, and every planet in it can be smashed.

Planet Crash Sandbox runs on real gravity. Every star, planet and moon pulls on every other, so orbits bend and worlds collide the way physics says they should. And one crash is just the start of the chaos: the wreckage keeps flying and sets off the next collision, and the next.

ORBITAL CHAOS
• Start with our own solar system, every planet wearing its real NASA map, or roll a new one from a whole galaxy of stars.
• Steer any world with three sliders, or tap Collide, pick a target and watch it change course to hit it.
• See the planets stretch and collide in a storm of lava particles, white-hot where they hit, then watch the lava orbit the star, cool to rock and rain down on the worlds around it. Moons tear apart when they stray too close, rings of rock scatter, and some of the wreckage falls into the star.
• Put a green dwarf at the centre, modelled on the first known green star, announced in 2026: a white dwarf that swallowed its own planets, their sodium soaking up its yellow and red light until it glows green.
• Run time from a slow crawl up to 8x and follow the chain reaction.
• Make it yours: adjust the diorama scale and particle size, and set it all against deep space or a clean white studio.

FLUID COLLISIONS
Two worlds, one impact. The planets meet as thousands of liquid particles under their own gravity, simulated live on your iPhone rather than played back from a recording, so no two crashes are the same. A graze drags out a glowing arm, and a head-on hit splashes both worlds into a molten cloud that pulls itself back together. Set the speed, angle, tilt and distance of the shot, then let it fly. Or stage the giant impact thought to have made our Moon: a Mars-sized Theia glancing off the young Earth, flinging its debris into orbit.

ON YOUR TABLE
Tap AR and the system lands on a real table in front of you. Walk right up to two planets about to collide for a front-row seat, crouch down to watch the lava sweep past at eye level, then pinch it bigger and circle the wreckage. Keep your room behind it, or swap in deep space or the white studio with one tap. Both modes work on your table, so the biggest crash in the solar system can happen in your living room.

CAPTURE IT
Tap the shutter for a photo of the crash, or hold it to record a video, with the controls left out. Turn your phone sideways to watch in landscape, and it records in landscape too.

FREE
• Our solar system, and new ones rolled from a whole galaxy
• Steering, Collide and every crash, in 3D and AR
• Twelve kinds of star, from red, orange and yellow dwarfs to blue giants, red giants, blue supergiants, white dwarfs, brown dwarfs and the green dwarf
• Ten kinds of world: rocky, barren, desert, volcanic, toxic, icy, cloud-wrapped and civilised worlds, gas giants and ice giants
• Fluid Collisions, rolling pairs from those ten kinds of world, Earth included
• Photos and videos of every crash

UNLOCK EVERYTHING
One purchase, paid once. No subscription.
• Neutron stars, pulsars, magnetars and black holes at the centre. A black hole bends the starlight behind it and heats the lava spiralling in until it glows white-hot.
• Five more kinds of world: lush, ocean, crystalline, ruined and industrial
• Edit any planet or moon: its type, its size, or a fresh roll of the dice
• Emoji debris: one tap and the wreckage turns into tumbling emoji, from faces and animals to pizza, rockets and ringed planets.
• Pangaea, the ice age Earth, ocean and battered worlds for Fluid Collisions
• Cinematic: compute a crash at up to 64,000 particles, then scrub back and forth through two minutes of it