The most remote planet native the sun, Neptune is the 3rd most massive. In spite of its great size, it to be the last world to be discovered, due to the fact that it lies so much away.

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Uranus and also Neptune: The Mysterious outer Giants (Image credit: lennythewonderdog.net)

Radius, diameter, and also circumference

Neptune is the 4th largest planet in terms of diameter, making that the the smallest in physical size of the gas giants. The typical distance from the facility of the planet to its surface is 15,299 miles (24,622 kilometers). However like most spinning bodies, Neptune"s rotation reasons it come bulge slightly roughly the equator. The resulting form is recognized as one oblate spheroid. The radius in ~ the poles is 15,125 miles (24,341 km), slightly smaller sized than the equatorial radius the 15,388 mile (24,764 km). The mean diameter throughout the world is 30,598 mile (49,244 km), nearly four times the diameter of Earth.


A trip approximately Neptune"s equator would certainly cover 96,129 mile (154,705 km). Together a trip might not it is in made on foot—the planet"s surface is spanned with water and also melted ice fairly than solid rock.


The planet"s surface area covers 2.9 billion square miles (7.6 billion square km).


Like all of the gas giants, Neptune has rings approximately it. The clumpy arcs expand as much as 39,105 mile (62,933 km) from the facility of the planet.

Density, mass, and volume

Although Neptune come in 4th in regards to diameter, it ranks 3rd in terms of mass, front of Uranus. The gas huge weighs in in ~ 1.02 x 1026 kilograms, or 102 trillion trillion kilograms. The is an ext than seventeen times as massive as Earth.

The rock, ices, and also gas that make up the icy huge fill a volume that 15 sunshine cubic miles (62 sunshine cubic kilometers), almost 58 time the volume the Earth.

The thickness of Neptune is 1.638 grams every cubic centimeter. The low thickness indicates that, choose Uranus, its atmosphere is consisted of of more ices 보다 Saturn and also Jupiter, resulting in scientists to contact it one "icy giant". The distance to Neptune from the sun keep the planet"s temperature low v the year, although part astronomers doubt the earth originally developed closer come the star.

Despite hosting a considerably lower mass, Neptune"s surface gravity is 2nd only come Jupiter.

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