Quote:
Originally Posted by avandonk
..... It should be a very lipstick red if anything as it is far down the spectrum to what humans perceive as red.
Bert
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As Bert suggests, H-alpha is deep red. Just look at the sun with a H-alpha solar filter
...which passes *only* H-alpha light to sub-angstrom precision...
The perceived colour is unmistakable. H-alpha emissions from nebulae are *exactly* the same colour....just a lot less bright.
A nebula however may have more than one emission (eg H-Beta) which will may give it a more magenta hue.
But as for the colour of H-Alpha, I would not have thought there is any debate.