Earth

**Addmsgd** · December 29th, 2012, 04:14 AM

Why earth spins? Is there any exact reason of this??

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**KALSTER** · December 29th, 2012, 04:18 AM

It is residual angular momentum from the proto-planetary disc. The rotation of the proto-planetary disc resulted for much the same reasons as water running down a drain all spinning in one direction.

**merumario** · December 30th, 2012, 06:17 PM

it spins because it is a spherical object that its world line is bend towards that of more massive object and it circles it,and when onething circles another,there is an angular velocity. the clear reason is that everything in the universe is moving.

**jrmonroe** · December 31st, 2012, 07:08 AM

Originally Posted by merumario

it spins because it is a spherical object that its world line is bend towards that of more massive object and it circles it,and when onething circles another,there is an angular velocity. the clear reason is that everything in the universe is moving.

I don't know what the above statements mean, but along the lines of what KALSTER said, most scientists accept the Solar Nebular Model that describes a spinning mass that eventually differentiates itself into the Sun and the planets, moons etc. Because of the spin of this mass, virtually all bodies of the Solar System spin/orbit along the same axis and in the same direction as the original mass.

**scoobydoo1** · December 31st, 2012, 07:59 AM

Originally Posted by jrmonroe

along the lines of what KALSTER said, most scientists accept the Solar Nebular Model that describes a spinning mass that eventually differentiates itself into the Sun and the planets, moons etc. Because of the spin of this mass, virtually all bodies of the Solar System spin/orbit along the same axis and in the same direction as the original mass.

This actually helps clear up a question I had 4 months ago here.

**KALSTER** · December 31st, 2012, 08:05 AM

Originally Posted by merumario

it spins because it is a spherical object that its world line is bend towards that of more massive object and it circles it,and when onething circles another,there is an angular velocity. the clear reason is that everything in the universe is moving.

The spin of the earth is not directly attributable to it simply orbiting the sun. That only takes care of the earth's orbit round the sun.