The human eye can spot a candle flame from 30 miles away! Learn more about this amazing organ

Think about this next time you complain that you have bad eyesight! The human eye is incredibly sensitive. It’s theoretically possible to see a candle flame from 30 miles away, and the farthest visible light we can see with the naked eye is the Andromeda galaxy, which is 2.6 million light years away!

Of course, there are some limitations. In order to see a candle flame from so far away, it would have to be completely dark and the Earth would have to be flat--or you’d have to look at it from on top of a mountain during a pitch black night!

(Source)