Neptune definition

nĕpto͝on, -tyo͝on
Neptune is the coldest planet in the solar system. Surface temperatures can get down to -235 degrees Celsius.
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It has a large storm in its southern hemisphere called the Great Dark Spot, similar to Jupiter's Greast Red Spot.
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The definition of Neptune is the eighth planet from the Sun.
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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.
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In size and color, it is almost a twin to Uranus.
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Its diameter is 30,775 miles which is four times more than Earth’s.
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Neptune’s orbit around the Sun takes 165 Earth years.
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Neptune's atmosphere consists of hydrogen, helium, ammonia and methane. It appears blue because of the methane in its atmosphere.
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The upper layer of Neptune's atmosphere consists of frozen methane and the lower, dark layer is made of hydrogen sulfide.
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The layers of the atmosphere swirl rapidly, up to 750 miles an hour, and occasionally there are huge storms that rotate like hurricanes.
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Neptune’s winds are the strongest in the solar system.
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Scientists think there may be a core of rock and ice.
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There are 13 moons orbiting around Neptune.
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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.
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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 750 mph.

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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.
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(roman mythology) The god of water, later identified with the Greek Poseidon.
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The sea.
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(rom. myth., person, proper) The god of the sea: identified with the Greek Poseidon.
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(person, proper) The sea personified.
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(place, proper) 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, ♆
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The eighth planet from the Sun and the fourth largest, with a diameter almost four times that of Earth. Neptune is a gas giant with a very active weather system, exhibiting extremely long and powerful storms with the fastest winds observed in the solar system. Neptune's axis is tilted 28.8° from the plane of its orbit, and its summer and winter seasons each last 40 years. For a period of 20 years out of every 248, Pluto's highly elliptical orbit crosses within that of Neptune. Neptune has four faint rings and 13 known moons and appears blue due to the absorption of red light by the methane within its atmosphere.
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Origin of neptune

  • Latin Neptūnus

    From American Heritage Dictionary of the English Language, 5th Edition