Why do most things in space spin and rotate around each other ?

Answer 1

This should help -http://www.phy6.org/stargaze/StarFAQ1.htm#q26

Answer 2

Conservation of angular momentum. Let's put it this way:

Gravity attracts things across ridiculous distances. And when they're attracted, they'll start moving toward each other. The only way that they run straight into each other if they started from rest is if nothing interferes with this exact straight course.

Which is pretty blasted unlikely, since EVERYTHING in the universe is attracting everything else! If it's pulled off the collision course, even a little bit, then it's going to end up going in circles around whatever it's attracted to.

Even when things do end up glomming together (probably because friction slowed its movement down, instead of pure gravity) unless it collided on that straight exact course it will have some of that rotational motion left, which will be translated to the object it hits. The combined duo will thus end up rotating in place. And like water going down a drain on the equator, once you get a bunch of something spinning down in one direction, it's much easier to go with the flow than against it.

So, in summary, because perfect collision courses are all but impossible, most things will end up moving around other things. And because it's easier to go with the flow, small-scale spin will tend to be emphasized so pretty much all substantial gravitational objects will end up rotating.

The only way out is to have something out there absorbing rotational energy. This happens more than you might think, because that is basically what tidal forces do. The Moon is slowly absorbing the Earth's rotation, and will eventually succeed in doing so. Likewise, Mercury is almost tide locked with the Sun, having only about 2/3 of a day per year.

Answer 3

The laws of gravitation. Mass and density define gravitational force. The spinning motion finds its origin in the big bang which gave every particle a forward motion, combined with the lateral motion confined by gravitational forces from surrounding masses.

Answer 4

Gravity and speed. When something moves at the correct speed away from another object in space, that other object pulls the first object towards it with gravity. The combination of the two forces brings the object to revolve.

Answer 5

I think it's caused by the natural spin of each atom. This, I believe, is caused by the magnetic attraction of the electron and proton.

Answer 6

Because gravity is a central force.

Answer 7

Cos they are happily in love.

Answer 8

Because if they didnt, they would run into each other.

Answer 9

Thats just what they do...