Given enough time, the comet-like planet could theoretically evaporate away completely, but it would take about a trillion years.

只要有足够时间，跟彗星一样的行星最终会完全蒸发掉，但那大约需要一万亿年。

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Comet-Like Planet to Disappear?

彗星样的行星会消失吗？

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Comet-like Planets Common?

彗星样的行星普通吗？

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Suppose the planet were hit by a comet-- this happened--something like this happened sixty-five million years ago, so it could happen again.

假设这个星球被一颗彗星击中-,这样的事，大约六千五百万年前,发生过，所以它还可能再发生。

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In this scenario, the gamma ray burst was caused by a large, comet-like object that fell into a neutron star.

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There is a precedent for dual classification: three icy bodies classed as asteroids are also listed as comets because they have shown comet-like behaviour in the past.

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The Spitzer observations suggest young planets circling the star are disturbing smaller comet-like bodies, causing them to collide and kick up a huge halo of dust.

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