There's a planet made of diamond: 55 Cancri e, an exoplanet twice the size of Earth and eight times its mass, appears to be made largely of diamond.

4. 有一颗由钻石构成的行星：55 Cancri e，这是一颗系外行星，其大小是地球的两倍，质量是地球的八倍，似乎主要由钻石构成。