At their distances from the star, the rocky planetary core would have taken so long to form that the gaseous disk would have dissipated before the core could attract the gas.
就它们与恒星的距离而言，其石质行星核恐怕需要极其长的成型时间，以至于在星核能够俘获气体前周围的气态盘恐怕就已经消散殆尽了。
The hot core collapses and begins to pulsate, eventually shedding its outer layers of gas to set the stage for the birth of a planetary nebula.
恒星高温的核心坍缩，并开始有规律的振动，最终气体外层迸散，为行星星云的形成提供了有利条件。
The finding suggests one commonly accepted model of planetary formation, where icy chunks glom into a core, wouldn't work here.
这项发现表明，一个被广泛认可的行星构成模型——由巨大的冰块填充的行星内核，将不会存在。
Mercury, planetary scientists knew, is uncommonly dense - most likely because its inner core of iron is very large relative to the rest of the planet.
行星科学家们知道，水星密度极高——最可能的原因是相对于其它部分水星内核中铁含量非常巨大。
Astronomers say the planet is heavily cratered and has a large iron core. Louis Friedman heads the Planetary Society. "mercury."
天文学家说这个行星坑坑洼洼，并拥有一个巨大的铁核。
The inner core pulling of The gear planetary frame can be solved by adopting combinative core.
采用带抽芯机构的组合压型，制作出了行星轮架整体蜡模。
The invention relates to an improvement method of a core rod of a metal rolled tube, in particular to a hollow core rod used for a planetary rolling mill.
本发明涉及一种金属轧制管的芯棒改进方法，具体地说是一种行星轧机用空芯棒。
The invention relates to an improvement method of a core rod of a metal rolled tube, in particular to a hollow core rod used for a planetary rolling mill.
本发明涉及一种金属轧制管的芯棒改进方法，具体地说是一种行星轧机用空芯棒。
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