Why does the Earth spin?
The people on Earth have the benefit of being exposed to the sun periodically, due to the rotation of Earth.Ãƒ’šÃ‚ The planets and the sun are formed inside the solar nebula, which was initially filled up with many dust particles and gases.Ãƒ’šÃ‚ By the combination of these gases and particles, the celestial bodies resulted.Ãƒ’šÃ‚ When there was a big explosion of a star called Supernova, the tidal energy of this explosion reached the total nebula, and smashed it.Ãƒ’šÃ‚ During this process each particle in the nebula attained a momentum.
According to Newton’s first law of motion, every particle will either be in the state of rest or in uniform motion, unless acted upon by a force.Ãƒ’šÃ‚ So the momentum gained by the particles make them move continuously.Ãƒ’šÃ‚ Some of them which have the same momentum combine, and become bigger and bigger.Ãƒ’šÃ‚ These big bodies that are formed must conserve their momentum.Ãƒ’šÃ‚ This is how the total solar nebula started to spin, and remained like that. Later, the planetary bodies have been created, and they were also rotating.
The planetary group settled down, and a few of them clustered into separate small groups, due to gravity.Ãƒ’šÃ‚ They keep on adding more particles as they rotate, and are adding the momentum of all these particles to them.Ãƒ’šÃ‚ However, each planet might be different due to the different momentum of each planet.Ãƒ’šÃ‚ For example, Venus rotates slower, and there is a shift in the axis of the Earth of about twenty three degrees.Ãƒ’šÃ‚ This might be due to some of the major collisions that have occurred in the past which have changed the rotation pattern of the planets.
As in space there is no friction; all these planetary bodies will keep on rotating with the momentum they have gained earlier.Ãƒ’šÃ‚ And they keep spinning further and keep on adding particles to add to their momentum.Ãƒ’šÃ‚ This is how spinning of the Earth also happened.