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。
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