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 地球之间是由非常寒暗的尘埃组成的长丝，阻挡了自后面反射星云的光线，看起就像流经其中的暗河流。

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

这个巨大旋质或" 星云" 开始却，而且，随着却开始聚集，并分开变成粒子环。

Nebula A cloud of gas and dust in interstellar space.

星云 星际空间中由气体尘埃组成的云。