Protoplanet hypothesis
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According to the
protoplanet hypothesis, several years back a massive cloud of dust and gas that
had a minimum of 10 billion kilometers made its way to space. With the passage
of time, the gravitation pull of the earth caused its diameter to get reduced. Another
reason why the diameter may have lessened is that a passing star exploded.
Because of the shrinkage, the cloud rotated faster than before. Based on the
hypothesis, solar systems originated in rotating disks made of dust with a
coating of ice derived from frozen gases. This eventually led to the formation
of planets.
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