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  1. More Images

    Neptune

    Eighth and farthest planet from the Sun in the Solar System

    Neptune is the eighth and farthest known planet from the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth. Compared to its fellow ice giant Uranus, Neptune is slightly more massive, but denser and smaller. Being composed primarily of gases and liquids, it has no well-defined solid surface, and orbits the Sun once every 164.8 years at an orbital distance of 30.1 astronomical units. It is named after the Roman god of the sea and has the astronomical symbol, representing Neptune's trident. Neptune is not visible to the unaided eye and is the only planet in the Solar System that was not initially observed by direct empirical observation. Rather, unexpected changes in the orbit of Uranus led Alexis Bouvard to hypothesise that its orbit was subject to gravitational perturbation by an unknown planet. Wikipedia

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  3. en.wikipedia.org

    Neptune is the eighth and farthest known planet from the Sun.It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet.It is 17 times the mass of Earth.Compared to its fellow ice giant Uranus, Neptune is slightly more massive, but denser and smaller.Being composed primarily of gases and liquids, [21] it has no well-defined ...
  4. en.wikipedia.org

    The Solar System [d] is the gravitationally bound system of the Sun and the objects that orbit it. [11] It formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.The Sun is a typical star that maintains a balanced equilibrium by the fusion of hydrogen into helium at its core, releasing this energy from its outer photosphere.
  5. en.wikipedia.org

    The new planet, at first called "Le Verrier" by François Arago, received by consensus the neutral name of Neptune. Its mathematical prediction was a great intellectual feat, but it showed also that Newton's law of gravitation, which Airy had almost called in question, prevailed even at the limits of the Solar System. [20]
  6. en.wikipedia.org

    True-scale Solar System poster made by Emanuel Bowen in 1747. At that time, Uranus, Neptune, nor the asteroid belts had been discovered yet. Discovery and exploration of the Solar System is observation, visitation, and increase in knowledge and understanding of Earth's "cosmic neighborhood". [1] This includes the Sun, Earth and the Moon, the major planets Mercury, Venus, Mars, Jupiter, Saturn ...
  7. en.wikipedia.org

    The following outline is provided as an overview of and topical guide to Neptune: . Neptune - eighth and farthest known planet from the Sun in the Solar System.In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 ...
  8. en.wikipedia.org

    An ice giant is a giant planet composed mainly of elements heavier than hydrogen and helium, such as oxygen, carbon, nitrogen, and sulfur.There are two ice giants in the Solar System: Uranus and Neptune.. In astrophysics and planetary science the term "ice" refers to volatile chemical compounds with freezing points above about 100 K, such as water, ammonia, or methane, with freezing points of ...
  9. en.wikipedia.org

    A hypothetical Solar System object is a planet, natural satellite, subsatellite or similar body in the Solar System whose existence is not known, but has been inferred from observational scientific evidence. Over the years a number of hypothetical planets have been proposed, and many have been disproved. However, even today there is scientific speculation about the possibility of planets yet ...
  10. en.wikipedia.org

    The original core of the Nice model is a triplet of papers published in the general science journal Nature in 2005 by an international collaboration of scientists. [4] [5] [6] In these publications, the four authors proposed that after the dissipation of the gas and dust of the primordial Solar System disk, the four giant planets (Jupiter, Saturn, Uranus, and Neptune) were originally found on ...
  11. en.wikipedia.org

    Planets whose orbits lie within the orbit of Earth. [nb 1] Mercury and Venus: Inner planet: A planet in the Solar System that have orbits smaller than the asteroid belt. [nb 2] Mercury, Venus, Earth, Mars: Outer planet: A planet in the Solar System beyond the asteroid belt, and hence refers to the gas giants. Jupiter, Saturn, Uranus and Neptune ...
  12. en.wikipedia.org

    At just 38 K (−235.2 °C), it is the coldest known planetary body in the Solar System. The closest approach to Triton, the last solid world Voyager 2 would explore close by, was about 40,000 km (25,000 mi). [4] A list of previous and upcoming missions to the outer Solar System can be found at the List of missions to the outer planets article.

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