不同光谱型星的起源必然是不一样的。

The origins of stars of differing spectral types must be dissimilar.

youdao

早型O，B型星有扩散运动和自转运动，而晚型发射线星则没有明显的扩散或收缩的整体运动。

The expansion and rotation of the early O, B type stars have been found, but the similar motions are not discernible for the late-type stars.

youdao

O型星的寿命更短（几百万年或者更少），在从星团分崩出来之前，它们就像 超新星 一样爆炸了。

The O stars are so short lived (a few million years or even less), they explode as supernovae before they can be scattered outside the cluster.

youdao