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Why Earth rotates on its axis?

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  • Why Earth rotates on its axis?


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Answer #1 | 23/07 2014 17:54
because if we didn't lets just said me and you and every life form on earth wouldn't be here.
Positive: 100 %
Answer #2 | 23/07 2014 15:16
The formation of the solar system started as a large cloud of gas and dust blown out of a supernova that over a very long period of time began to collapse due to the effect of gravity. As this cloud collapses, it starts to rotate around its center of gravity. Slowly over time a large amount of material collects in the center and also, further out, moving with the gathering accretion disc, smaller localized areas of matter start to congregate and rotate about their respective gravitational centers. The large blob of material in the center eventually becomes the sun and the smaller localized areas further out become the planets. It's the rotation of these discs of collecting matter that ends up as the rotation of the planets. As empty space is in effect frictionless, once something is moving it will keep moving. Its a fundamental principal known as the conservation of momentum.
Positive: 100 %
Answer #3 | 23/07 2014 15:02
Research "the conservation of angular momentum".
Positive: 33.333333333333 %
Answer #4 | 23/07 2014 15:09
All heavenly bodies rotate about an axis relative to the cosmic background radiation. All the planets, asteroids and comets within the solar system; the Sun and all the stars, all rotate at greater or lesser rates relative to each other too. The universe was not completely smooth from the beginning, and gravity coalesced matter in a swirling motion which ended up as rotation about an axis.
Positive: 25 %
Answer #5 | 23/07 2014 14:54
Inertia keeps it going and the inertia came from the rotation of the elements of the solar system coming together to form the planets and sun.
Answer #6 | 23/07 2014 15:47
http://www.universetoday.com/14491/why-does-the-earth-rotate/
Answer #7 | 23/07 2014 16:49
It is from gravity
Answer #8 | 23/07 2014 15:24
The planets spin and orbit the Sun because momentum is conserved. An atom, particle or asteroid in motion has momentum. If two with the same mass are moving directly toward each other, the momentum of that system is zero. As they collide, heat is produced and parts may fly in different directions but the total momentum stays at zero. Our solar system was formed by the gravitational collapse of a vast cloud of particles. Each of these particles was mostly moving in a random direction but the average rotational momentum for the total cloud system was in a certain direction – the same direction as the present solar system spin. As the cloud of particles condensed by gravity to form our solar system, there were trillions of particle collisions and gravitational perturbations, dampening and reducing much of the random motion. The average rotational angular momentum of the entire system was conserved. As the particles fell toward the center merging and forming the Sun, planets and other bodies, they retained their angular momentum, resulting in the spin of those bodies. Just as an ice skater will spin faster when the arms and legs are pulled inward, angular momentum caused the particles to move faster as they collect at the Sun and planets. . .

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