Here's something I've been pondering for some time (meaning of life can wait a bit longer...
). Long exposure photos, and even with just highly sensitive CCD's we can see colour in nebulae. Even with a big dob we can see pink and blue coming of M42. But, if we were much closer to a bright nebula like M42, would our eyes be able to detect any colour coming off it? Just our naked, unassisted eyes. Colour or not?
Mental.