Very roughly, 50000 km.
neptunes size is 12% grater then the earth
well the orbit is about 59,000000000 km ( 3km455666674x34km
Neptunes diameter is just over four times that of Venus' diameter, and just under four times that of Earth's diameter.
The diameter of Planet Uranaus is 51,118 km, and the diameter of Neptune is 49,528 km.
Jupiter - 88,700 miles (142,800 km) in diameter Saturn - 74,898 miles (120,536 km) in diameter Uranus - 31,690 miles (51,118 km) in diameter Neptune - 30,775 miles (49,528 km) in diameter Earth - 7,926 miles (12,756 km) in diameter Venus - 7,521 miles (12,104 km) in diameter Mars - 4,222 miles (6790 km) in diameter Mercury - 3,031 miles (4,878km) in diameter Pluto - 1,413 miles (2274 km) in diameter Jupiter - 88,700 miles (142,800 km) in diameter Saturn - 74,898 miles (120,536 km) in diameter Uranus - 31,690 miles (51,118 km) in diameter Neptune - 30,775 miles (49,528 km) in diameter Earth - 7,926 miles (12,756 km) in diameter Venus - 7,521 miles (12,104 km) in diameter Mars - 4,222 miles (6790 km) in diameter Mercury - 3,031 miles (4,878km) in diameter Pluto - 1,413 miles (2274 km) in diameter Jupiter - 88,700 miles (142,800 km) in diameter Saturn - 74,898 miles (120,536 km) in diameter Uranus - 31,690 miles (51,118 km) in diameter Neptune - 30,775 miles (49,528 km) in diameter Earth - 7,926 miles (12,756 km) in diameter Venus - 7,521 miles (12,104 km) in diameter Mars - 4,222 miles (6790 km) in diameter Mercury - 3,031 miles (4,878km) in diameter Pluto - 1,413 miles (2274 km) in diameter
because it so far from sun (4,503,000,000 km)
The planets in order of largest to smallest:Jupiter - (diameter = 142,800 km)Saturn - (diameter = 120,660 km)Uranus - (diameter = 51,118 km)Neptune - (diameter -= 49,528 km)Earth - (diameter = 12,756 km)Venus - (diameter = 12,104 km)Mars - (diameter = 6787 km)Mercury - (diameter = 4879.4 km)Earth is the 5th biggest or 4th smallest.
Mercury's diameter (at the equator) = 48,800,000cmVenus' diameter = 121,040,000cmEarth's diameter = 127,560,000cmMars' diameter = 67,940,000cmJupiter's diameter = 1,429,840,000cmSaturn's diameter = 1,205,340,000cmUranus' diameter = 511,140,000cmNeptune's diameter = 495,320,000cm
The circumference of a circle with a diameter of 16 km is: 50.3 km
120,536 kilometers in diameter.
The diameter of Venus is about 95% of the diameter of the Earth. Venus is 12103.6 kilometers in diameter from any reference. (Its slow spin does not produce a bulge.) Earth has an equatorial diameter of about 12756.2 kilometers and a polar diameter of about 12713.6 kilometers.
Venus, at 12,104 km, is closest to the Earth's diameter of 12,756 km.