Colliding galaxies can glow pink and blue as stars are born and light up the hydrogen clouds around them.

当恒星诞生时，相互碰撞的星系会发出粉红色和蓝色的光，照亮它们周围的氢气云。

The spectrum would look like this, and you'd always see this line spectrum from a heated hydrogen cloud or a compound that contains hydrogen.

光谱看起来像这样，你总是会从加热的氢云或含氢化合物中看到这条线谱。