Which subtle colors, generally too faint for rods to register, can astrophotographers capture in deep space objects?
Answer
Pale green of airglow or pinkish hues of hydrogen gas clouds
Astrophotography utilizes long exposure times, often stacking multiple images, to accumulate light energy far beyond the capacity of the human eye in real-time. This technique allows specialized sensors to register light emissions that are too faint for the rod cells to detect, such as the subtle green emissions from airglow occurring in the upper atmosphere, or the delicate pinkish hues associated with ionized hydrogen gas clouds within the galaxy itself.
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