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protoplanet

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protoplanet [ˌprəʊtəʊˈplænɪt]
n
(Astronomy) a planet in its early stages of evolution by the process of accretion


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Once protoplanets grew to diameters of 200 kilometers or larger, the radioactive elements trapped within those masses generated enough heat to melt minerals at the orbs' cores.
Lastly, water, once it is formed, must be gathered together on a protoplanet before life can evolve--essential sequencing.
In the subsequent cycle, all the eight protoplanets become separated (Figures 6 and 7).
 
 
 
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