Your eyes are extremely sensitive, detecting even the smallest photons of light. A small fuzzy patch of light can be seen with the naked eye if you look at the constellation Andromeda on a very clear night. If you can make out that tiny blob, you've seen as far as human vision can go without the aid of technology. Andromeda is the largest galaxy closest to our own Milky Way. However, in intergalactic space, "near" is a relative term; the Andromeda galaxy is 2.5 million light years away. There were no humans when the photons of light that struck your eye started their journey. We still had a lot of growing up to do. You're looking back in time 2.5 million years and seeing an almost incomprehensible
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