行星是由围绕着年轻恒星旋转的气体和灰尘的盘状物所组成。
Planets form from a disk of gas and dust swirling around a young star.
仙女星座戏弄着双核心——在星座的中心有着两个明亮的区域——认为这是恒星和气体卵形盘的迹象。
Andromeda sports a "double nucleus" - two bright spots at its heart - thought to be a sign of an oval disc of stars and 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。
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.
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