Why is the technique known as averted vision effective for observing the Andromeda Galaxy?
Answer
It utilizes peripheral rod cells that are more sensitive to faint light
The human eye contains more rod cells in its periphery, which are specialized for detecting low-light conditions. When trying to spot the faint, diffuse light of the Andromeda Galaxy, looking slightly to the side prevents the light from falling on the center of the retina, which is better suited for high-resolution daytime vision but less effective for dim nighttime objects.
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Andromeda and the Local Group (go to 2020 4K edition) - YouTube
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