Gravity Lab: the same jump on nine worlds.
How high would you jump on the Moon? Keep the same 3.0 m/s launch speed, change only gravity, and watch how long it takes to land. Walk around a first-person training platform and compare what your jump reveals.
One jumper. Different gravity.
Science mode: the same 3.0 m/s jump without any extra forces. Compare gravity using the measured arc.
Cross the aerial platforms.
Tap Jump for a short jump. Hold Jump to activate the airborne booster. Energy lasts up to 1 second and recharges on the ground in about 2.5 seconds. Each cleared stage unlocks a longer course, from 3 to 10 checkpoints.
The fictional thruster auto-adjusts its force to mass × (local gravity + 5.5 m/s²). Your unpowered fall still depends on the world; the game does not measure how high an unaided person can jump.
Swipe or use arrows. Images are not scaled to true diameters. Selected image credit: NASA Space Place.
Change the downward pull.
First-person walking and jumping in an artificial gravity chamber.
Image reference: NASA/JPL-Caltech Perseverance. The platform is an artificial learning environment.
Reach the finish platform to complete a Flight Trial.
UNBOOSTED REFERENCE ONLY — the following jump predictions exclude the fictional thruster. Flight Trials progress is reported above.
Choose an environment, then enter the lab. Controls work with a keyboard or touch.
Desktop: WASD / arrow keys move · drag to look · Space to jump. Mobile: left pad moves · swipe the view to look · Jump button.
Earth-like gravity is reproduced inside a fictional level test chamber. This is not a visit to any real planetary surface. Backgrounds use sourced space imagery. Selected-world observation image: NASA Apollo 17 Earth photograph. Imagery is cropped as a conceptual observation wall, not a navigable landscape.
Gravity changes the *entire* jump arc.
With the same idealized launch speed, the upward velocity falls steadily under each world's constant downward acceleration.
Two separate experiences: The controlled experiment reports unpowered jumps only. Flight Trials adds a fictional, variable-strength thruster and obstacles for practice with gravity, thrust, energy budgeting and landing. A boosted jump must not be read as a planetary jump measurement.
A reproducible comparison
Our test person has a fixed 70 kg mass. A training launcher gives the same 3.0 m/s takeoff speed everywhere, regardless of how muscles, spacesuits or fatigue might really behave. No air resistance, atmospheric drag or changing gravity with height is included.
Maximum height: v₀² / (2g). Air time: 2v₀ / g. Weight force: mass × g, in newtons. Mass stays 70 kg; force changes.
For example, an Earth jump rises about 0.46 m, while the identical Moon launch rises about 2.81 m using the rounded NASA gravity figures below. This is a numerical model, not a documented human jump record.
Same person; one changing variable
| Place / test condition | Gravity | Jump height |
|---|---|---|
| Earth | 9.8 m/s² | 0.46 m |
| Moon | 1.6 m/s² | 2.81 m |
| Mars | 3.7 m/s² | 1.22 m |
| Jupiter reference level* | 23.1 m/s² | 0.19 m |
*Jupiter has no walkable solid surface. Its gravity here is modeled in an artificial platform; not a prediction of surviving or walking in Jupiter’s atmosphere.
What is real, and what is a model?
Numerical source: NASA NSSDC Planetary Fact Sheet — rounded gravity values in m/s². NASA's giant-planet figures refer to atmospheric levels; they are not solid floors.
Visual references: Moon: NASA Apollo 17 Taurus–Littrow scene. Mars: NASA/JPL-Caltech Perseverance Jezero imagery. Earth and giant-planet imagery come from existing credited Space Atlas NASA/JPL assets. Backgrounds are illustrative context, not exact surface or atmospheric simulations.
Limitations: A fictional test deck holds the person safely on every world, including Venus and the four giants. Movement speed is an input convention and is held constant; the simulation primarily models vertical free fall. It does not simulate pressure, temperature, life support, real walking biomechanics, orbital motion or observed terrain dimensions.
Continue learning: compare planetary weight or explore gravity and orbits.
What would you predict?
Before switching from Earth to the Moon, predict whether your jump height changes by less than twice, about three times, or more than five times. Then enter the lab, jump once on each, and explain the result using the gravity readings.