4 ms·
You’ve confused radius and mass. 10x mass = 10x gravity, and then radius is a totally separate issue. Mass and surface gravity are proportional, while radius de
by QAPereo 9y ago
You’ve confused radius and mass. 10x mass = 10x gravity, and then radius is a totally separate issue. Mass and surface gravity are proportional, while radius depends on issues of composition.
- kijin 9y agoSurface gravity absolutely depends on the radius. Gravitational force is proportional to mass and inversely proportional to the square of distance. Radius is the distance between the center of a planet and its surface. If this sounds wrong, please see the Wikipedia page for Saturn and explain how a planet with 95 times the mass of Earth is listed as having a surface gravity of only 1.065 g. (Actually, I was wrong above: the increased radius alone would reduce the surface gravity of this hypothetical planet by a factor of 4.6, not just 2, assuming Earth-like density.)