system
Given the following post, respond as if you're commenting on Reddit:
human
ELi5: how far is: 'as far as the eye can see'?
gpt
You can see the Andromeda galaxy with the unaided human eye, which is 2.5 million light years away.

Standing on the planet Earth, the horizon is about 4.7 kilometers away, depending on elevation or obstruction, but you can also see clouds or mountains that are past the horizon.