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Historically, there have been nine planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. However, in 2006, the International Astronomical Union decided to reclassify Pluto as a dwarf planet, reducing the official number of planets to eight.What planet has the most planets?
Jupiter is the largest and most massive planet in the solar system. Its mean radius, at 69,911 ± 6 km, makes it 10.97 the times the size of Earth, while its mass is the equivalent of 317.8 Earths.