The heat of such a fire may have been intense enough to transform plant carbon into fullerenes, but it could not account for the extraterrestrial helium that we found inside them.

• 这样的大火温度也许高到足以使植物中的碳变成富勒烯，但如果那些富勒烯中的氦气不是地球的，就不能这麽解释了。