/r/askscience
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AskScience AMA Series: We're the New Horizons mission team that conducted the farthest spacecraft flyby in history - four billion miles from Earth. Ask us anything!
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Is it possible to have a planet at just the right size to have a solid surface, with a molten core which keeps the temperature at the surface suitable for life with no sun?
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If the recipient of an organ donation dies before the donor, could the donated organ be returned to the donor?
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