Named for its stallion-like silhouette, the iconic Horsehead Nebula lies roughly 1,300 light-years away from ... making the animal-like structure visible. But in another five million years, ...
来自MSN3 个月
What Is a Nebula?
Two different views of the Horsehead Nebula. On the right is a view of the nebula in visible light, taken using the European Southern Observatory’s Very Large Telescope in Chile (eso0202a).