> Assuming the mass of the planet remains constant, wouldn't you get 4 times the gravitational force at the surface? No idea why you'd ask this question but y

> Assuming the mass of the planet remains constant, wouldn't you get 4 times the gravitational force at the surface? No idea why you'd ask this question but yes. But the original statement is wrong isn't it, if you half the diameter you 1/8 the gravity [1/8 the mass] [edit] But you'd also be twice closer, which is 4 times the force, got it.