Answer:
Only one law: There is a force of mutual attraction between any two masses, that is
directly proportional to the product of the masses, and inversely proportional to the
square of the distance between them.
That's all you need, along with some math, to explain and predict the motions and tracks
of everything we see in space, so closely that it was all we needed for almost 200 years
after Newton published it. Einstein explained the tiny discrepancies, with Relativity.