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doit_the_clown doit_the_clown
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7 years ago
Which features highlight and outline the spiral arms in a spiral galaxy?

(a)   Very bright, hot, O and B stars and their surrounding nebulae.
(b)   Many very old, bright, red stars that have burned off their dust and gas clouds and have been orbiting the galactic center for long enough that they have settled into spiral arms.
(c)   Hot gas and dust clouds, which have been condensed and heated by a spiral density wave but which do not yet contain stars.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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discovererdiscoverer
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doit_the_clown Author
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7 years ago
Thanks
jamiebonf99
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Yesterday
Thank you, thank you, thank you!
Tim0301
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2 hours ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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