现有理论指出：行星是恒星诞生之后的残留物——碟状尘埃和气体的产物。
Current theory holds that planets are made from disks of gas and dust left over after star birth.
接下来，天文学家们检测了近期发生星系碰撞的微妙标志，例如扭曲的碟状中心或者拖着尾巴的恒星。
Next, the astronomers checked the galaxies for the subtle signs of a recent galactic collision, such as a warped disk or a trailing tail of stars.
它们‘清楚地显示了至少一些巨型恒星由环绕的碟状气体和尘埃凝聚而成，就如我们的太阳在45亿年前一样。’
They "clearly show that at least some massive stars grow by accreting material from a circumstellar disk of gas and dust, just like our sun did roughly 4.5 billion years ago."
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