49,620 km diameter
diameter neptune s diameter is 49620 km while the sun s is 1377648 km so you would be able to fit 27 of them into the diameter of the sun and you would still have room for 70 % of another one mass so the sun is 332946 17 19585 times more massive than neptune triton neptune i triton try tun is the largest moon of neptune with a diameter of 2700 kilometers 1680 miles it was discovered by william lassell a british astronomer on october 10 1846 scarcely a month after neptune neptune is the fourth largest planet in terms of diameter making it the smallest in physical size of the gas giants the average distance from the center of the planet to its surface is 15299 miles 24622 kilometers but like most spinning bodies neptune s rotation causes it to bulge slightly around the equator jupiter 88700 miles 142800 km in diameter saturn 74898 miles 120536 km in diameter uranus 31690 miles 51118 km in diameter neptune 30775 miles 49 52 8 km in diameter neptune is the 4th biggest uranus has a radius of 25500 km and a mass of 14 5 earth s it has a density similar to jupiter 1 27 gm cm 3 it also spins rapidly and has a day of 17 hours and 14 minutes this is the internal rotation period the cloud layers rotate in about 14 hours neptune is the fourth largest planet in our solar system and it is the smallest of the giant gas planets neptune has a diameter of 34503 miles 55528 kilometers its volume is 57 7 times the volume of earth which means that 57 earths could fit inside of neptune with a little room left over neptune is the smallest of the four giant outer planets the diameter at its equator is about 30775 miles 49528 kilometers as measured at a level of the atmosphere where the pressure is 1 bar the pressure at sea level on earth
http://www.answers.com/Q/How_big_is_Neptune_compared_to_the_sun http://solarviews.com/eng/triton.htm http://www.space.com/18924-how-big-is-neptune.html http://www.answers.com/Q/How_big_is_Neptune http://astronomy.nmsu.edu/tharriso/ast105/UranusandNeptune.html http://coolcosmos.ipac.caltech.edu/ask/141-How-big-is-Neptune- http://kids.britannica.com/comptons/article-274034/Neptune
how big is neptune