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Gas Giants (Outer Solar System)


Terrestrial Planets of the Inner Solar System

Planetesimals were massive enough that their gravity influenced motions of other planetesimals. This increased the frequency of collisions, through which the largest bodies grew most rapidly. Eventually, regions of the nebula were dominated by large bodies called planetary embryos. The process of collision and accretion continued until only four large bodies remained Mercury, Venus, Earth, and Mars, the terrestrial planets of our inner solar system.


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