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If light is the fastest thing in the universe why do black holes suck it in?
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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 a halogen light bulb? What halogen is used and why is this better?
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