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Can someone please explain how vision works? When we see everyday objects how does it work? Is light reflected off the objects and then back into our eyeballs?!? I always heard when you look up to the stars it's like looking into the past. Even our sun, when we see the sun we're seeing the sun as it was 8 minutes ago. Can someone explain this further? And When we see everyday objects are we seeing them as they were billionths of a second into the past? And if so, is this due to the brains processing speed, or what causes that? And if looking great distances away is like a time machine...say there was a gigantic mirror in space that is 1 light year away and we had a really good telescope, could we look at that mirror and see Earth 2 years into the past? This is so very interesting to me, any response would be greatly appreciated. :)