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Which planet has the longest orbit?
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Pluto is the farthest planet from the Sun, and has the longest orbit. On Pluto, a year lasts for 248.5 Earth years. Pluto's orbital path is unusual because it is elongated. When farthest from the Sun, it is about 4,500 million miles (7,400 million km) away - nearly 50 times farther away than Earth. Pluto is by far the smallest planet, and its moon is half its size. There may be other planets outside the orbit of Pluto, but they must be very far away, otherwise they would already have been found. | | Pluto's orbital path sometimes crosses over that of Neptune |
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Previous:
Back
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Book:
1001
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Section:
Space
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Chapter:
Planets and Moons
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