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Currently Pluto is 3 billion miles away and it takes 160days for a radio signal to travel
Added 3+ months ago:
Never mind, it's 4.5hrs
3e9 miles divided by 1.86e5 miles per second equals 4 1/2 hours (pretty close).
At the nearest, Pluto and Earth are 2.66 billion miles (4.28 billion km) apart.
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