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Old 11-05-2013, 05:18 PM
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RickS (Rick)
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Originally Posted by philiphart View Post
hmm.. is a Planetary Nebula a type of emission nebula? If I add that as a sub-category of emission nebula, what are all the other emission nebula called?

And now this just confuses me more:

After reading that maybe classes of nebula could be emission, reflection, dark, planetary and SNR? Like most taxonomies, there will be things that don't fit perfectly and room for differences of opinion
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