The authors suggest two possible explanations. One is the explosion of a star of over 90 solar masses, which will often expel a hydrogen-poor shell shortly before dying.
作者给出了两种可能的解释：一是，一个90倍于太阳质量的星体爆炸，会在其自身毁灭前释放出贫氢壳。
The authors suggest two possible explanations. One is the explosion of a star of over 90 solar masses, which will often expel a hydrogen-poor shell shortly before dying.
作者给出了两种可能的解释：一是，一个90倍于太阳质量的星体爆炸，会在其自身毁灭前释放出贫氢壳。
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