The definition of Neptune is the eighth planet from the Sun.
Facts About Neptune
- Astronomers had noticed that Uranus was not always where they expected it to be, so they concluded that another planet’s gravity was influencing it.
- Neptune is the coldest planet in the solar system. Surface temperatures can get down to -235 degrees Celsius.
- In size and color, it is almost a twin to Uranus.
- Its diameter is 30,775 miles which is four times more than Earth’s.
- Neptune’s orbit around the Sun takes 165 Earth years.
- Neptune's atmosphere consists of hydrogen, helium, ammonia and methane. It appears blue because of the methane in its atmosphere.
- The upper layer of Neptune's atmosphere consists of frozen methane and the lower, dark layer is made of hydrogen sulfide.
- The layers of the atmosphere swirl rapidly, up to 750 miles an hour, and occasionally there are huge storms that rotate like hurricanes.
- It has a large storm in its southern hemisphere called the Great Dark Spot, similar to Jupiter's Greast Red Spot.
- Neptune’s winds are the strongest in the solar system.
- Scientists think there may be a core of rock and ice.
- There are 13 moons orbiting around Neptune.
- There are three rings that are fairly thick and one very faint ring. They are much smaller than the rings of Saturn and are made of dust.
- In 1989, Voyager 2 observed geysers or volcanoes that were spewing liquid nitrogen and recorded 11 moons.
An example of Neptune is a planet with regular winds of around 750mph.
The planet Neptune.
Neptune definition by Webster's New World
- Rom. Myth. the god of the sea: identified with the Greek Poseidon
- the sea personified
Origin: ModLthe fourth largest planet of the solar system and normally the eighth in distance from the sun: it has a thin, icy ring system around its equator: diameter, c. 49,530 km (c. 30,780 mi); period of revolution, 164.79 earth years; period of rotation, 16.11 hours; 13 satellites; symbol, ♆
Origin: Middle English ; from Classical Latin Neptunus, probably ; from Indo-European an unverified form nebhtus ; from base an unverified form nebh-, moist from source nebula
- Neptunian adjective
Neptune definition by American Heritage Dictionary
- a. Roman Mythology The god of water, later identified with the Greek Poseidon.b. The sea.
- The eighth planet from the sun, having a sidereal period of revolution around the sun of 164.8 years at a mean distance of 4.5 billion kilometers (2.8 billion miles), a mean radius of 24,000 kilometers (15,000 miles), and a mass 17.2 times that of Earth.
Origin: Latin Neptūnus.
- Nep·tuˈni·an adjective
Neptune - Cultural Definition
In astronomy, a major planet, the eighth planet from the sun. Neptune is named for the Roman god of the sea. Neptune is similar in size and composition to Uranus. It is usually visible only through a telescope and was discovered in the 1840s. For a period ending in 1999, Pluto's orbit took it inside the orbit of neptune. (See solar system; see under “Mythology and Folklore.”)
- Some astronomers have suggested that Pluto is not a planet in the usual sense but is an object more like an asteroid, and that Neptune, therefore, is actually the outermost planet.
neptune - Science Definition