peculiar nebula
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有可能是原始星云大爆炸形成各种行星的时候，刚好由一块比较特殊的含铁量丰富的星云形成的，也有可能它的地壳表面原来也是石头，后来被太阳烤焦后变成的。
It may have formed from an unusually iron-rich part of the primordial cloud that gave birth to all the planets, or it may have had a normal rocky shell that got blasted or fried off.
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