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Colour seen in the night sky depends to a degree on an individual's
colour perception; some people can see green or pink tints in some
of the brighter nebulae such as M42[ the Orion Nebula], whilst others
see no colour at all in the same objects. Some stars are obviously
tinted orange/red, and some double stars show different colours from
each other. Some colour is obvious when viewing Mars and Jupiter.
Even very short photographic exposures[ a few seconds] will show a
lot of colour in some objects.
raymo
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