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2006-12-08 23:07:31 · 8 answers · asked by Anonymous in Science & Mathematics Astronomy & Space

8 answers

It's axis and pull of gravity helps it revolve .

2006-12-08 23:40:32 · answer #1 · answered by curious~me 3 · 0 1

Conservation of angular momentum. This is the millionth time I've answered this question. Easy points! Anyway, during the formation of the solar system, after the sun collapsed from a cloud of gas and dust in space, it began to rotate. This was because all of the stuff falling into the sun added energy to the sun's rotation, like an ice skater pulling thier arms in close in a spin; they spin faster with all limbs in, then when they stick out arms and legs they slow down. This is the law of the conservation of angular momentum.

Simply put, if you are spinning around with your arms out, your hands are traveling at a certain speed, or better yet, they are traveling a set distance in a set time. If you pull them close to your body (still spinning around) your hands will still be trying to go the same distance in the same time--with the net effect that your total rotation will speed up!

Now, what does this have to do with the earth?

When the sun collapsed and started spinning, the energy was too great to keep it all in one ball, and there was too much stuff coming in, so it spread out into a disk, sort of like when you spin and toss pizza dough. The disk contained gas, dust and over time this gas and dust started to stick together--remember, we're talking millions of years here! Anyway, the dust became clumps, clumps became pebbles, then rocks, then boulders, then mountains, then asteroids and then planets. This is called accretion, the slow build up of material. During accretion, the Earth aqcuired it's spin in much the same way as the sun...conservation of angular momentum. As bits fell to earth, they added rotational energy.

The moon formed (most likely) after a body about the size of Mars collided with earth, spilling material back into space. This was probably the last significant impact (spin wise) in the earth's development. After the blasted out debris re-formed into the moon, the earth was spinning about once every six hours! Slowly though, the moon has been moving away from the earth--and like the hands and arms of a figure skater moving away from the body, the Earth has been slowling down ever since.

Could the earth stop spinning? No. It could become tidally locked to the moon, but that would mean only that it's rotation period was equal to the moons orbit period, meaning that the moon would stay the same place in the sky and not move--but that is going to take a long time to happen!

Anyway, hope this answer helps. Try looking up some ofthis on Wikipedia. It is a good resource for science.

2006-12-08 23:48:22 · answer #2 · answered by ~XenoFluX 3 · 1 1

The rotation of the earth make turn

2006-12-08 23:09:58 · answer #3 · answered by jayashree p 1 · 0 1

When the earth was formed from a rotating gas cloud that same rotation is present today.

2006-12-08 23:16:44 · answer #4 · answered by Anonymous · 0 0

The magnetic and gravitational field of the sun makes all the planets rotate and revolve around the sun.

2006-12-08 23:11:48 · answer #5 · answered by So_Hot_An_Ice 2 · 0 1

well, i dunno much on this, but i think the gravitational force of the Sun makes the earth turn on its axis. Or may be its own force. They say that earth became round by turning. Its just continuing? :-)

2006-12-08 23:13:07 · answer #6 · answered by Swathi Rao 3 · 0 1

What makes all planets in our solar system turn on their own axis ?

2006-12-08 23:12:10 · answer #7 · answered by debussyyee 3 · 0 1

because of the gravitational pull of the sun.

2006-12-08 23:25:56 · answer #8 · answered by Hussain 2 · 0 1

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