All of this works out to a surface gravity of 11.15 m/s 2 (or 1.14 g), which again is measured at Neptune's cloud tops.Īll in all, gravity runs the gamut here in the solar system, ranging from 0.38 g on Mercury and Mars to a powerful 2.528 g atop Jupiter's clouds. But, being a gas giant, it has a low density of 1.638 g/cm 3. All told, it is 3.86 times the size of Earth and 17 times as massive. With a mean radius of 24,622 ± 19 km and a mass of 1.0243×10 26 kg, Neptune is the fourth largest planet in the solar system. Hence, why its surface gravity (measured from its cloud tops) is slightly weaker than Earth's – 8.69 m/s 2, or 0.886 g. However, as a gas giant, its density (1.27 g/cm 3) is significantly lower than Earth's. With a mean radius of 25,360 km and a mass of 8.68 × 10 25 kg, Uranus is approximately 4 times the size of Earth and 14.536 times as massive. Mars Gravity Model 2011, showing variations of gravity accelerations over Mars’s surface. In accordance with Isaac Newton's law of universal gravitation, the gravitational attraction between two bodies can be expressed mathematically as F = G (m 1m 2/r 2) – where F is the force, m1 and m2 are the masses of the objects interacting, r is the distance between the centers of the masses and G is the gravitational constant (6.674×10 -11 N m 2/kg 2 ). This is the standard for measuring gravity on other planets, which is also expressed as a single g.
#G FORCE SCALE COMPARISON FREE#
This means that an object, if held above the ground and let go, will accelerate towards the surface at a speed of about 9.8 meters for every second of free fall. And when it comes to the planets of our solar system, which vary in size and mass, the strength of gravity on their surfaces varies considerably.įor example, Earth's gravity, as already noted, is equivalent to 9.80665 m/s 2 (or 32.174 ft/s 2). Depending on the size, mass and density of the object, the gravitational force it exerts varies. Basically, gravity is dependent on mass, where all things – from stars, planets, and galaxies to light and sub-atomic particles – are attracted to one another.
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