ANSWERS: 3
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We haven't even see the other end of the picture. If you were looking through a camera, would you know what was happening on the other side of the camera?? i believe it is the same concept.
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our limited lifespan will not allow us to get more than the briefest glimps of the "big picture" - what we see is thousands to billions of years out of date & most of the stars no longer exist, ask me again in a billion years or so
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I think our main limitation is that most stuff is just too far away for us to get to.
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