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Jupiter - 88,700 miles (142,800 km) in diameterSaturn - 74,898 miles (120,536 km) in diameterUranus - 31,690 miles (51,118 km) in diameterNeptune - 30,775 miles (49,528 km) in diameterEarth - 7,926 miles (12,756 km) in diameterVenus - 7,521 miles (12,104 km) in diameterMars - 4,222 miles (6,790 km) in diameterMercury - 3,031 miles (4,878 km) in diameter