3 ms·
Mass has little do escape velocity, it's density. Consider that any planet/sun could be shrunk until it's a black hole, with effectively infinite escape veloci
by sliken 9y ago
Mass has little do escape velocity, it's density. Consider that any planet/sun could be shrunk until it's a black hole, with effectively infinite escape velocity.
- haberman 9y agoEarth density: 5.51 g/cm³, escape velocity: 11.2 km/s Jupiter density: 1.33 g/cm³, escape velocity: 59.5 km/sec I think it's more than just density.
- ouid 9y agofirst of all, mass contributes more to escape velocity than density. V_e=k*(m^(1/3)d^(1/6)). (scaling the mass is quadratic compared to scaling the the density). Second, the density of rocky planets is bounded from below pretty close to the density of earth.
- palunon 9y agoA black hole has the same escape velocity as a star of the same mass, as long as you are well outside the swarzchild radius. Inside or near it, the effect of general relativity makes things very weird. In case of mostly anything else, Newtonian physics apply correctly, and the relevant thing is mass (and distance from the center). The escape velocity from a body is sqrt(2GM/d) where d is the distance from the center of mass, M is the mass of the object, and G is the universal gravitational constant. Note that if the sun was replaced with a black hole of the same mass, the orbit of the earth wouldn't change.