About

Mass and weight are often used interchangeably in daily conversation, but in physics, they are distinct properties. Mass (m) is the amount of matter in an object and remains constant throughout the universe. Weight (W), however, is the force of gravity acting on that mass. A 70 kg astronaut possesses the same mass on Earth as they do in deep space, but their weight varies dramatically.

This tool simulates the gravitational environments of major Solar System bodies, diverse moons, and even extreme stellar objects like White Dwarfs. By adjusting the gravitational acceleration (g), users can visualize the physical stress of high-gravity worlds or the floating sensation of microgravity environments like the ISS or asteroids.

Formulas

The weight W on any celestial body is derived from Newton's second law:

W = m × g_body

Where m is the mass derived from the user's input weight on Earth (W_earth):

m = W_earthg_earth

Standard Earth gravity is g_earth ≈ 9.80665 m/s².

Reference Data

Celestial Body	Type	Gravity (m/s²)	Relative g
Earth	Planet	9.807	1.000
Moon	Satellite	1.62	0.165
Mars	Planet	3.72	0.379
Jupiter	Gas Giant	24.79	2.528
Sun (Surface)	Star	274.0	27.94
Europa	Satellite	1.31	0.134
Titan	Satellite	1.35	0.138
Pluto	Dwarf Planet	0.62	0.063
Neutron Star	Stellar Remnant	≈ 2 × 10¹²	2 × 10¹¹

Frequently Asked Questions

No. Your mass (the amount of "stuff" you are made of) remains exactly the same. Only your weight changes because Mars has less mass than Earth and therefore pulls on you with less force.

Surface gravity depends on the planet's mass and its radius. A planet with high mass but a very large radius (like Saturn) might have surface gravity surprisingly close to Earth's.

Technically, there is plenty of gravity at the ISS altitude (~90% of surface gravity). However, the ISS is in "freefall" around the Earth. This creates a state of weightlessness (microgravity), effectively resulting in 0 perceptible weight.

No. Aside from the lack of a solid surface and toxic atmosphere, the gravity (2.5x Earth) would put immense strain on the heart and circulatory system, making simple movement exhausting.