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  1. Neptune ( Latin: Neptūnus [nɛpˈtuːnʊs]) is the god of freshwater and the sea in Roman religion. He is the counterpart of the Greek god Poseidon. In the Greek tradition, Neptune is the brother of Jupiter and Pluto; the brothers preside over the realms of heaven, the earthly world, and the underworld. Salacia is his wife.

  2. en.wikipedia.org › wiki › NeptuneNeptune - Wikipedia

    Neptune is the eighth and farthest-known Solar planet from the Sun. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth, slightly more massive than its near-twin Uranus.

    • 5.43 km/s
    • 0.6713 day, 16 h 6 min 36 s
    • 2.68 km/s (9,650 km/h)
    • 164.8 yr, 60,195 days, 89,666 Neptunian solar days
  3. Neptune (mythology) Statue of Neptune, 2nd century AD, Prado Museum, Spain. Neptune ( Latin: Neptūnus) is the god of water and the sea in ancient Roman religion and mythology. His Greek equivalent is the god Poseidon. The Roman conception of Neptune was mainly influenced by the Etruscan god Nethuns. Neptune was associated with fresh water as ...

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  5. Neptune ( Latin: Neptūnus [nɛpˈtuːnʊs]) is the god of freshwater and the sea in Roman religion. He is the counterpart of the Greek god Poseidon. In the Greek-influenced tradition, Neptune is the brother of Jupiter and Pluto; the brothers preside over the realms of Heaven, the earthly world, and the Underworld.

    • History
    • Structure
    • Neptune's Rings
    • Neptune's Moons
    • Observation
    • Exploration
    • Other Websites

    Discovery

    The first possible sighting of Neptune is thought to be by Galileo as his drawings showed Neptune near Jupiter. But Galileo was not credited for the discovery since he thought Neptune was a "fixed star" instead of a planet. Because of Neptune's slow movement across the sky, Galileo's small telescope was not strong enough to detect Neptune as a planet. In 1821, Alexis Bouvard published the astronomical tables of the orbit of Uranus. Later observations showed that Uranus was moving in an irregu...

    Crediting and naming

    When Neptune was discovered, there was also a lot of arguing between the French and the British. It was about who was to deserve credit for the discovery. Later, an international agreement decided that both Le Verrier and Adams together deserved credit. However, historians reviewed the topic after the rediscovery in 1998 of the "Neptune papers" (historical documents from the Royal Greenwich Observatory). It had seemingly been stolen and kept by astronomer Olin Eggen for nearly three decades a...

    Mass and composition

    At 102.413×1024kg, Neptune's mass puts the planet between Earth and the largest gas giants. Neptune has seventeen Earth masses but just 1/18th the mass of Jupiter. Neptune and Uranus are often considered to be part of a sub-class of a gas giant known as "ice giants." It is given their smaller size and big differences in composition compared to Jupiter and Saturn. In the search for extrasolar planets, Neptune has been used as a reference to determine the size and structure of the discovered pl...

    Weather and magnetic field

    One difference between Neptune and Uranus is the level of its meteorological activity. When the Voyager spacecraft flew by Uranus in 1986, the winds on that planet were observed to be mild. When Voyager flew by Neptune in 1989, powerful weather events were observed. The weather of Neptune has very active storms. Its atmosphere has the highest wind speeds in the Solar System. It may be powered by internal heat flow. Regular winds in the equatorial region have speeds of around 1,200 km/h (750 m...

    Tiny blue-colored rings have been discovered around the blue planet. They are not as well known as the rings of Saturn. When these rings were discovered by a team led by Edward Guinan, originally, they thought that the rings might not be complete. However, this was proven wrong by Voyager 2. Neptune's planetary ringshave a weird "clumpy" arrangement. The scientists think that it may be because of the gravitational contact with small moons that orbit near them. Proof that the rings are incomplete first began in the mid-1980s, when stellar occultation were found to rarely show an extra "blink" just before or after the planet occulted the star. Pictures from Voyager 2 in 1989 solved the problem when the ring system was found to have several faint rings. The farthest ring, Adams, has three famous arcs now named Liberté, Egalité, and Fraternité(Liberty, Equality, and Fraternity). The existence of arcs is hard to understand because the laws of motion predict that arcs spread out into a si...

    Neptune has a total of 14 known moons.As Neptune was the Roman god of the sea, the planet's moons were named after lesser sea gods or goddesses. The largest moon of Neptune is Triton. Triton was discovered on October 10, 1846 by British astronomer William Lassell. Unlike all other large planetary moons, Triton orbits in the other direction to the other moons. This shows the moon was probably captured and maybe was once a Kuiper belt object. It is close enough to Neptune to be locked into a synchronous orbit. It is also slowly moving into Neptune and may one day be torn apart when it passes the Roche limit. Triton is the coldest object that has been measured in the Solar System, with temperatures of −235°C (38 K, −392 °F). Neptune's second known moon (by order of distance), the odd moon Nereid, has one of the most unusual orbits of any satellite in the Solar System. Nereid is so far from Neptune that it requires 360 Earth days to make one orbit. It causes the largest elliptical orbit...

    You cannot see Neptune just by looking at the sky, you need a telescope or binoculars. It is because of Neptune has a normal brightness between magnitudes +7.7 and +8.0. It can be out-shined by Jupiter's Galilean moons, the dwarf planet Ceres, and the asteroids 4 Vesta, 2 Pallas, 7 Iris, 3 Juno and 6 Hebe. A telescope or strong binoculars will show Neptune as a small blue dot that looks similar to Uranus. The blue color comes from the methane in its atmosphere. Its small size in the night sky has made it difficult to study visually. Most telescopic data was quite limited until the arrival of the Hubble Space Telescope and large ground-based telescopes with adaptive optics. The average distance between Neptune and Sun is about 4.5 billion km.Therefore Neptune completes its orbit in every 164 years. On 12 July 2011, Neptune completed its first orbit since its discovery in 1846.

    Currently, only one spacecraft has visited Neptune. NASA's Voyager 2probe made a quick flyby of the planet with its closest encounter on 25 August 1989. One of Voyager 2's important discoveries was its very close fly-by of Triton where took pictures of several parts of the moon. The probe also discovered the Great Dark Spot. However, it had now disappeared after the Hubble Space Telescope took pictures of Neptune in 1994. Originally thought to be a large cloud or cyclonic storm system.It was later guessed to be a hole in the visible cloud deck. The pictures sent back to Earth from Voyager 2 in 1989 became the basis of a PBS all-night program called Neptune All Night.

  6. Neptune (mythology) Neptune ( Latin: Neptūnus [nɛpˈtuːnʊs]) is the god of freshwater and the sea in Roman religion. He is the counterpart of the Greek god Poseidon. In the Greek tradition, Neptune is the brother of Jupiter and Pluto; the brothers preside over the realms of heaven, the earthly world, and the underworld. Salacia is his wife.

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