Protoplanet
"Protoplanet" in a Sentence (1 examples)
Tyrix, one of the largest objects in Thal's asteroid belt, is a metallic asteroid with an iron-nickel core under a rocky olivine mantle. It is possibly a remnant protoplanet prevented from forming into anything bigger by gravitational disturbances from Xerceo.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.