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Did the Universe expand during Big Bang faster than speed of light?
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If we put a mirror millions of light years away and reflected earth, could we see what earth looked like millions of years ago?
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How do we know the Universe is expanding, and expanding into nothing?
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If the universe is expanding, what is it expanding into?
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What is "light" pressure?
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13/02/2018 19:46:54 by Bill S |