/r/askscience
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Are there known instances of a satellite (moon) with a satellite of it's own? Is there a theoretical limit to the daisy chain?
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If the earth's orbit shifted such that it travelled around the sun 1 second per hour faster (IE, an hour become 59 minutes and 59 seconds), how long would it take people to notice? Would there be any ecological concerns?
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If a huge and dense enough amount of coherent light was emitted, would it create a black hole traveling at the speed of light?
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