I foresee two possibilities. One, coming face to face with Uranus would put man into shock and he'd simply pass out. Or two, the encounter could create a time paradox, the results of which could cause a chain reaction that would unravel the very fabric of the space time continuum, and destroy the entire universe!
Granted, that's a worse case scenario. The destruction might in fact be very localized, limited to merely our own galaxy.
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