The Orion Nebula appears colorless when viewed visually through a telescope, but in color photographs it has a multicolored color. Why?

The human eye contains two types of light-sensitive cells – rods and cones. In this case, cones perceive color, but do not work in low light conditions, and rods give only a black and white image, but work even in very low light. When you look through a telescope, almost all objects are not bright enough for the cones to see them, but enough for the rods. Cameras, both film and digital, have no such limitation. Moreover, for astronomical photography, special equipment is usually used, designed to work in extremely low light conditions.

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