Science fiction has dreamed of diamond planets for many years.

多年来，科幻小说总幻像著钻石行星的存在。

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The discovery also raises the question of whether there are other diamond planets studding the Milky Way like jewels on a tiara.

这项发现也提出了一个问题：银河系里是不是还分布着其它“钻石行星”，就像冠饰上的珠宝一样呢？

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Belonging to a class of worlds known as diamond planets, 55 Cancri e is thought to be rich in the element carbon, which can exist in a variety of structural forms such as graphite (the material used as pencil lead), graphene, or diamond.

BBC: Oddballs: The strange worlds beyond our Solar System