This swirling mass or " nebula" began to cool and, as it did, it condensed and separated into rings of particles.

这个巨大旋涡状物质或" 星云" 却，而且，随着却聚集，并分变粒子。

Nebula A cloud of gas and dust in interstellar space.

星云 星际空间中由气体和尘埃云状物。

Between M78 and Earth are long filaments of very cold and dark dust, blocking the light from the reflection nebula behind and looking like dark rivers running through it.

在 M78 和地球之间是由非常寒和黑暗尘埃长丝状物，阻挡了来自后面反射星云光线，看起来就像流经其中黑暗河流。