Question

i was just thinking today and an idea popped in my head that why do all planets revolve around sun in a plane like way . I mean that why dont they move like electrons in an atom like one from top to bottom ,one from left to right etc. but they all move either left to right or right to left not any one have it's revolving path perpendicular to the revolving path of other planet . Anyone know it please answer this question is not letting me concentrate in any work

Answer 1

Originally Answered: Why does every planet orbit sun horizontally but not vertically?

Because of the way the solar system formed.

Every star (and its planets, if any) begins as a large cloud of gas and dust, called a nebula. As the nebula comes together under its own gravity, the cloud shrinks and begins to spin. That spin is just the combined angular momentum of all the stuff shrinking into one place, the way water going down a drain tends to assume a spiral - seeking the most efficient way to get where it’s going.

But the big shrinking nebula doesn’t just stay in the shape of an amorphous spinning cloud - It flattens into a disk as it spins. This flattening behavior is the cloud’s way of seeking the most efficient path to a stable motion. Wherever the MOST angular momentum of the system is, that strongest momentum will choose a PLANE OF ROTATION for the entire system.

Once the majority of the matter in the shrinking cloud has chosen its own plane of rotation, everything else will be gravitationally pulled into the same plane, so that the whole spinning mess is in one big disk. (called an accretion disk)

Then the star forms, and the planets form. Remember, all the stuff that forms the planets is already in the same plane of rotation, so the planets are born having that same motion