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The diameter of the planet Neptune is 49,528 kilometers.
That is, the diameter of Neptune is about 3.88 times the Earth's diameter.

en.wikipedia.org/wiki/Neptune

Neptune is the eighth and farthest known planet from the Sun in the Solar System . In the Solar ... The planet's distance from Earth gives it a very small apparent size, making it challenging to study with Earth-based telescopes. Neptune was ...

www.space.com/18924-how-big-is-neptune.html

Dec 14, 2012 ... The most distant planet from the sun, Neptune is the third most massive. Despite its great size, it was the last planet to be discovered, because it ...

www.universetoday.com/22044/size-of-neptune

Dec 9, 2008 ... [/caption] Neptune is so dim and distant that you can only see it with a moderately powerful telescope. But Neptune is the 4th largest planet in ...

coolcosmos.ipac.caltech.edu/ask/141-How-big-is-Neptune-

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 34,503 miles (55,528) ...

solarsystem.nasa.gov/planets/neptune/facts

Discovery Date of Discovery: 23 September 1846 Discovered By: Urbain Le Verrier, John Couch Adams, Johann Galle Orbit Size Around Sun Metric: ...

www.britannica.com/place/Neptune-planet

Neptune: third most massive planet of the solar system and the eighth and outermost planet from the Sun. Because of its great distance from Earth, it cannot be ...

kids.britannica.com/students/article/Neptune/345012/274034-toc

Neptune - Size, Mass, and Density - Neptune is the smallest of the four giant outer planets. The diameter at its equator is about 30775 miles (49528 kilometers ), ...

www.ducksters.com/science/neptune.php

One large storm was photographed by Voyager 2 when it passed by Neptune in 1989. It was called the Great Dark Spot. The storm was as big as the size of the ...

theplanets.org/neptune

This storm is around the same size as Earth's moon. Neptune spins very quickly on its axis. The planets equatorial clouds take 18 hours to complete one rotation.