GRAVITY ATLAS
Interactive planetary physics lab
Explore our solar system

Same universe.
Different gravity.

What if you jumped on Mars? How long would a dropped object fall on Neptune? Explore gravity, escape velocity, and trajectories across all eight planets.

01 / Choose a planet

Select a world to explore

02 / Planet physics

Earth • reference world

Gravity at a glance

Reference values at approximately the planet's cloud-top or mean radius.

Surface gravity
9.81m/s²
1.00 × Earth's
Escape velocity
11.19km/s
Ideal launch from surface
Weight of 70 kg mass
686.7N
Mass stays 70 kg
Planet mean radius
6,371km
Approximate
On gas and ice giants, “surface gravity” is a conventional reference value at an atmospheric level—not a solid surface you could stand on.

Gravity lab

Run a vertical jump or drop a ball. Idealized motion: no air resistance, constant gravity.

DROP • Earth
Fall time2.02 s
Impact speed19.81 m/s
Travel distance20.0 m

Drop from rest at 20 meters. Change the inputs or choose a different planet.

Gravity comparison

Compare all eight planets with the same scale.

How the physics works

Values are approximate; the simulator uses a simple, ideal physics model.

Free fall from rest
t = √(2h/g)
v = √(2gh)
h = drop height, g = gravitational acceleration
Vertical jump
h_max = v₀²/(2g)
t_air = 2v₀/g
v₀ = launch speed, with landing at launch height
Escape velocity
v_escape = √(2GM/R)
G = gravitational constant, M = planetary mass, R = radius
Weight vs. mass
W = mg
Mass remains constant; weight changes with gravity.

Planetary mass and radius are rounded reference values. Surface gravity is calculated using GM/R², while escape velocity uses √(2GM/R). Real-world motion differs due to atmospheres, rotation, variable gravity, and terrain. The jump simulator assumes a vertical launch with the same initial speed on every planet.