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冷和黑暗尘埃组成长丝状物，阻挡了自后面反射星云，看起就像中黑暗河。

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" 开始冷却，而且，随着冷却开始聚集，并分开变成粒子环。

Nebula A cloud of gas and dust in interstellar space.

星云 星际空间中由气体和尘埃组成云状物。