As I said before, you could spend a lifetime exploring Orion on his own, but we have a whole universe to explore together, so we best get a ...
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What Is a Nebula?
Hubble Telescope image of the Horsehead Nebula. Credit: T.A.Rector (NOIRLab ... green is singly-ionized sulfur, and red indicates doubly-ionized oxygen. Credit: NASA, ESA, J.