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.
- Rom. Myth. the god of the sea: identified with the Greek Poseidon
- the sea personified
Origin of NeptuneModL the 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 of NeptuneMiddle English ; from Classical Latin Neptunus, probably ; from Indo-European an unverified form nebhtus ; from base an unverified form nebh-, moist from source nebula
- 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 equatorial diameter of 49,528 kilometers (30,775 miles), and a mass 17.25 times that of Earth.
Origin of NeptuneLatin Neptūnus.
top:the Roman god
bottom: the planet Neptune