All Questions
4 questions
2
votes
0
answers
55
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How to algorithmically distinguish between different types of nebulae?
I remember that there are five types of nebulae:
Planetary nebulae have not much to do with planets, but are emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red ...
- 5,657
3
votes
1
answer
1k
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Nebula and its colors
A Nebula has bright awesome colors that include red, blue, green, orange, white, etc?
They're result of excitation of electrons.
Is there a clear explanation as to which color is attributed to an ...
- 793
7
votes
1
answer
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Why are O III lines so prominent in the spectra of emission nebulae when the amount of oxygen relative to hydrogen is a million times smaller?
Looking at spectra of emission nebulae like the Lagoon Nebula, the $[\text{O III}]$ lines are prominent in intensity. However, the abundance of oxygen is minuscule compared to hydrogen. How then are ...
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4
votes
1
answer
209
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How long do hot X-ray sources last?
Some X-ray sources in nebulae are caused by hot materials in the millions of degrees that formed in supernovae. What's the cooling rate of this stuff? How long does it stay this hot?
If we would take ...
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