Planetary migration can be brought on by interactions between young planets and other material in the planetary formation disk, according to computer simulations of planetary formation. For a very long time, it was thought that the planets all originated exactly where they are now.
This was a straightforward assumption based on the fact that the Solar System is now in a very stable state. Therefore, there was no reason to think that a procedure that could have significantly altered the locations of the planets had ever taken place. The Planetary Migration theory contends the opposite.
Planetesimals, or small residual celestial entities like asteroids and comets, were present in the empty spaces between the planets when our Solar System was still forming 4.5 billion years ago. The gravitational pull of the Giant planets finally cleaned out these planetesimals, bringing the Solar System to its current state.
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