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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
Andromeda is the furthest thing you can see with the naked eye (appearing as a faint smudge in the sky). With a total apparent size of about 4 degrees, or more than 8 times the apparent size of the full moon, it makes an outstanding object for binoculars.