The andromeda galaxy is faintly visible to the naked eye. when you look at the andromeda galaxy, the retina of your eye is absorbing light that has traveled through space for to reach you.

The light has traveled through space for two and a half million light years. Someone can do a simple Google search to find this answer, but you need to use keywords from the question. After looking at a few sites that discussed astronomy, I compared the websites to see if the results were the same, and they were.

The enviroment with hedge hogs

Dis the answer you perception is how you see the world