The circle in the sky highlights one of the furthest objects the human eye can see without optical aid. The Andromeda Galaxy (M31)


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The circle in the sky highlights one of the furthest objects the human eye can see without optical aid. The Andromeda Galaxy (M31) lies 2.5 million light-years away and requires dark moonless skies far from city lights and dark adapted pupils. When you see the light from this approaching spiral galaxy you're looking at photons that took 2.5 million years to arrive at the Earth and no Homo Sapiens when it left on it's journey to your eye and registered as an image in your 3lb mass of almost 90 billion neurons.