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These color illusions are fairly common, but do not necessarily explain the observations of those who report faint red or pinkish colorations in M42 (nor should they have to, as it is quite possible that red from H-alpha is being seen).

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Quote:

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Neitz, Jay & Jacobs, Gerald H. (1986). "Polymorphism of the long-wavelength cone in normal human colour vision." Nature. 323, 623-625.
As for numbers, it won't take a long search of available literature to bring up some study, but suffice it to say that there is some variation in the color sensitivity of different people. In any case, there is enough evidence to consider the reports of sightings of color in bright emission nebulae (even red) to be possible.

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No please bring up the numbers (I did). What are the variations? "some variation" is still vague. How could you tell if "some" is "enough". How much is that "some"?

If you tell the numbers (and they are what I know) I will try to show you that they are definitely not enough (and you will try to show that maybe stretiching etc etc... perhaps maybe^3... they are hopefully... almost nearly enough ). Tell the numbers so that we have a firm point. (also for those people who cannot access the paper).


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PS let me show you an example.

Premises:

- people on average run 100 meters in 20 seconds (say):
- somebody runs faster than others;

So, let us try to answer these questions:
a) is there *enough evidence* that somebody can run 100 meters in less than 20 seconds?
b) is there *enough evidence* that somebody can run 100 meters in 10 seconds?

Edited by Mauro Da Lio (12/03/07 02:44 PM)

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