单词	protostar
释义	protostar /ˈprəʊtəʊstɑː / noun Astronomy A contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun.Elongated chains of dust grains like these appear in the early stages of planet formation around a young protostar, according to a microgravity experiment inside a rocket.... By peering in wavelengths not visible to the naked eye, through the nebula's gas and dust, astronomers can identify very young stars and even protostars - those that are about to light up, once the gases reach a critical density. Rotation forces some of the matter to accumulate in a disk rotating around the protostar (s).
随便看	over-and-under overanxiety overanxious overanxiously overarch overarching overarchingly overarm over-articulate over-articulated over-articulation overate over-award hand-lining handlist handlock handloom hand-loomed hand-loose hand lotion hand luggage handmade handmaid handmaiden handmake

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