Planetary theorists also have a second problem on their hands, thanks to work by Nikku Madhusudhan, an astrophysicist at Princeton University in New Jersey2.

行星理论学家们手上还握着第二个问题，这还得感谢新泽西普林斯顿大学的天文物理学家Nikku Madhusudhan2。

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This body, known as 55 Cancri e, "is likely covered in graphite and diamond rather than water and granite, " according to astronomer Nikku Madhusudhan from Yale University.

BBC: Oddballs: The strange worlds beyond our Solar System