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If you traveled to the other side of the universe... and you had a humongous telescope and looked back at earth, could you see it when it was in the stage when it was covered in ice? If the other end of the universe is to far to see that, then could you find a location that you could see this? If you had a even stronger telescope that you could see the animals, could you travel so far that when you look back you see the dinosaurs?
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If you travel to the other side of the universe, you will not see the dinosaurs (assuming you are travelling faster than light). As you move towards the end, you will be as is while the earth will continue to age significantly. Maybe when you look back, civilizations may have already crumbled or global warming must have already ruined our society.
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The farthest observed galaxies are 13 billion light years away. If you went that far with your telescope, you wouldn't even be able to see the Sun because it did not exist that long ago. You wouldn't even have to leave the galaxy to see them building the pyramids, for instance.
The Sun has only existed for about 4.5 billion years, give or take, and that's how many light years away you would have to go to see the birth of our solar system. If you went to Sirius, you would be able to witness the events of around the year 2000 here. Yes, there is a location to witness the events of Earth's history. However many years ago the event happened that you want to witness, just go that many light years away to see it. The real problem is that you would need to have faster-than-light travel because you could never catch up with the light from those events otherwise, and by the time you got far enough away, you would be looking back too late to see the events. You would have to be at some point 8.5 light years away right now if you wanted to witness the 9-11 attacks, for instance. |
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If you got that far away (instantly) then looked back at earth you wouldn't see anything at all there. The furthest edge of the universe is 13.5 billion light years away, and that old. Our happy little planet didn't come into being until 4.5 billion years ago. You'd have to wait about 9 billion years for the light of our sun to reach you. Not going anywhere for a while? Hope you bring a couple trillion Snickers bars to tide you over!
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