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Pluto is the known planet with the longest period of revolution around the sun. Its 'year' ... the time it takes to make one full circuit in its orbit ... is 248 earth years.

Since it's discovery in 1930, Pluto has traveled less than 1/3rd of a full revolution around the sun.

It holds this record for 2 reasons:

1). Among all of the known planets, Pluto is farthest from the sun, so its orbit is the largest of all.

2). Its speed in orbit is the slowest of all the planets.

These factors are connected ... thanks to the way gravity operates, the farther any satellite is from the central body, the slower it moves in its orbit. Actualy, it would be Neptune, because Pluto is gennerally not a planet. It was classified as a Dwarf planet on October, 2008.

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