2006-11-12 00:49:24 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
It has absolutely nothing to do with gravity. Look up "Conservation of Angular Momentum" on wikipedia.org and it will explain the whole thing.
2006-11-12 01:59:43 · answer #1 · answered by stevewbcanada 6 · 0⤊ 0⤋
It has no relation to gravity. Earth's spin is a force product of its formation and thus related to the formation of the Universe. It is also not constant, it is slowly spinning less rapidly. There was a time when days were only 4 hrs long, the moon drag has slowed earth's spin. Take your question beyond earth, why does any celestial body move, rotate, or orbit?? You have to take in account the original forces at the Big Bang, assuming the Big Bang were a proven theory, and then those forces and celestial bodies interact with one another coming to a certain balance of forces given by the clusters of galaxies, etc etc. Yes, now earth rotates around the sun, but before that earth still had a momentum and a rotation even if it was not earth as it can be recognized now.
2006-11-12 12:17:32 · answer #2 · answered by Alex S 3 · 0⤊ 0⤋
The same reason that a ball-bearing spins in it's unit.
The inside edge is closer to the central point of rotation (the centre of the sun) than the outside edge. This difference caused the spin. "So why is the sun spinning then?" I hear you ask - because it's spinning around the centre of the galaxy.
I have no idea why the galaxy spins although i'm sure it's related.
2006-11-14 06:59:18 · answer #3 · answered by andrew w 3 · 0⤊ 0⤋
The earth spin because of the gravitational force which is in the earth which makes it spin
2006-11-12 09:21:21 · answer #4 · answered by Ramasubramanian 6 · 0⤊ 1⤋
All celestial bodies spin around their own axis and gyrate around the heaviest body in a particular system e.g our solar system. This is in order to maintain their spatial position in space. The speed of rotation around their own axis or around another body would depend on their individual mass.Each system thus rotates around another system and maybe a group of systems rotate around a still heavier body in a galaxy. The galaxies in their turn do the same in the universe .May be there are many more universes, each behaving similarly and groups of universes doing the same -ad infinitum. Coming back to earth 's spin around itself; it is perhaps provides it gyroscopic rigidity and thereby stability in space. What gave it the spin in the first instance is the the same source that gave us the life.
2006-11-13 00:43:51 · answer #5 · answered by som b 1 · 0⤊ 0⤋
gravity forces between the sun and earth thats why we have an orbit
2006-11-12 11:33:54 · answer #6 · answered by myself-me 2 · 0⤊ 0⤋
I think it is because of gravitational forces and the impact of forces of other planets of the universe.
2006-11-12 08:58:27 · answer #7 · answered by suchsi 5 · 0⤊ 1⤋
gravitational force, without it all planets meteors etc.. bump and explode like balls of shower all around the universe.
2006-11-13 08:41:17 · answer #8 · answered by chikqie 2 · 0⤊ 0⤋
attraction netween earth and another planets in the solar system
2006-11-12 08:52:25 · answer #9 · answered by lostship 4 · 0⤊ 1⤋
gravitational forces within our atmosphere and the likest of space and weight density
2006-11-12 08:51:23 · answer #10 · answered by Anonymous · 0⤊ 1⤋