eli5 Does gravity act the same for large objects as it does for small objects. So if I were to shrink planet Earth and the moon to say half the size and the distance between them too then would they continue orbiting. Would this also apply if they somehow became much larger?

Question

eli5 Does gravity act the same for large objects as it does for small objects. So if I were to shrink planet Earth and the moon to say half the size and the distance between them too then would they continue orbiting. Would this also apply if they somehow became much larger?

In: 9

Answer 1

So, if you double the size you get 8 times more mass, 8 times more gravity.

Distance: if you double the distance you get 1/4 of the gravity.

Double up everything keeping the same scale:

8 mass but 1/4 gravity because distance = doubled attraction between the two.

Now, it works or not depending of moon speed.

Should be: 0,35 of its actual angular speed. So 2.85 times more days to do an orbit, 80 days for an orbit, in a double all dimensions scenario.