#Pluto takes 248 years to make one orbit around the sun. So that means the entire history of the United States has unfolded in the time its taken Pluto to circle the sun once. The last time Pluto was in its current position, we didn’t understand how species evolved or how germs transmitted diseases. Aviation was still decades away and spaceflight wouldn’t happen for nearly 200 years. But this time around, when Pluto finishes its orbit, it’s going to be met by a tiny robot sent by a curious species of apes living on a planet billions of miles away.

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