有关宇宙起源的大爆炸理论的出现,迫使天文学家认识到,第一代恒星肯定不包含金属元素;它们被称为第三星族(Population III)。
Stars of both Population II and Population III are probably present in CR7, Dr. Sobral and histeam report. While the blue cloud is metal-free, according to spectral measurements, the colorof the rest of the galaxy is consistent with more evolved stars making up most of its mass.This suggests, they write, that the Population III stars there are late bloomers of a sort,forming from leftover clouds of pristine material as the galaxy was sending out its light 12.9billion years ago.
索夫拉尔和他的团队报告称,CR7星系中可能存在第二星族和第三星族的恒星。虽然根据光谱测量,这个蓝色星云不包含金属元素,但该星系剩余部分的颜色与演化程度较高的、构成其大部分质量的恒星一致。他们写道,这说明该星系中的第三星族恒星形成较晚,由该星系129亿年前发出光线时的崭新物质的残余星云发展而成。
The only alternative explanation, Dr. Sobral said, is something so spectacular and unlikelythat astronomers do not know if it has ever happened, namely a primordial cloud bypassing thestar stage and collapsing directly into a black hole. That, he noted, is impossible to rule outbecause nobody really knows what it should look like.
索夫拉尔表示,除此之外的唯一解释是,发生了一些惊人的、意想不到的事,天文学家还不知道这种事是否发生过,那就是原始星云越过恒星阶段,直接坍缩为黑洞。他指出,不能排除这种可能性,因为没人真的知道它看上去是什么样子。
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