Orbital mechanics · g = GM / r²

Surface Gravity

The gravitational acceleration at a body's surface, from its mass and radius. Earth's is about 9.8 m/s².

Mass (M⊕)Radius (R⊕)

Surface gravity9.8203m/s²

Formula: g = GM / r²

Worked example

With the default inputs, surface gravity evaluates to 9.8203 m/s² — Earth → 9.8 m/s². The validator recomputes this against the known value on every build, so the formula is checked, not asserted.

Highlights

›Earth: 9.8 m/s²

Universal Gravitation

Knowledge connections

Associated withUniversal Gravitation

Sources

Facts on this topic will be cited from these primary and reference sources.

NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.

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Surface Gravity

Worked example

Highlights

The physics behind it

Knowledge connections

Sources

Surface Gravity

Worked example

Highlights

The physics behind it

Knowledge connections

Sources