单词	protoplanet
释义	protoplanet /ˈprəʊtəʊˌplanɪt / noun Astronomy A large body of matter in orbit around the sun or a star and thought to be developing into a planet: this analysis supported the view that the moon originated from a glancing collision between the earth and another protoplanet 4,500 million years ago... Learning more about the protoplanet won't be fast or easy. The protoplanet candidate orbits about 70 times further from its star than Earth does from the Sun. It isn't clear how the latest suspected protoplanet is being formed. Origin 1940s: from proto- + planet.
随便看	seignorage Seikan Tunnel seine seine net seiner Seinfeld, Jerry seise seisin seismal seismic seismical seismically seismicity seismic reflection seismic refraction seismic velocity seismic wave seismo- seismogram seismograph seismographic seismographical seismological seismologically seismologist

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