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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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  2. science.nasa.gov

    Science Mission Directorate

    https://science.nasa.gov › neptune

    Neptune. Pluto & Dwarf Planets. Solar System Home; Explore This Section Neptune. Neptune is the eighth, and most distant planet from the Sun. ... Eyes on the Solar System lets you explore planets, moons, asteroids, comets, and the spacecraft exploring them from 1950 to 2050. ... The Solar System; The Universe; Science; Aeronautics; Technology ...
    • Neptune Facts - Science@NASA

      Neptune is the only planet in our solar system not visible to the naked eye. In 2011 Neptune completed its first 165-year orbit since its discovery in 1846. Neptune is so far from the Sun that high noon on the big blue planet would seem like dim twilight to us.

    • NASA's Hubble Celebrates Decade of Tracking Outer Planets - Science@NASA

      Encountering Neptune in 1989, NASA's Voyager mission completed humankind's first close-up exploration of the four giant outer planets of our solar system. Collectively, since their launch in 1977, the twin Voyager 1 and Voyager 2 spacecraft discovered that Jupiter, Saturn, Uranus, and Neptune were far more complex than scientists had imagined. There was a lot […]

  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. smithsonianmag.com

    Nov 5, 2024The eighth planet in our solar system was detected, not with telescopes, but through math. In 1846 , scientists had observed irregularities in Uranus' orbit, as if an invisible counterweight ...
  5. britannica.com

    Dec 14, 2024Neptune, third most massive planet of the solar system and the eighth and outermost planet from the Sun.Because of its great distance from Earth, it cannot be seen with the unaided eye.With a small telescope, it appears as a tiny, faint blue-green disk.It is designated by the symbol ♆.. Neptune is named for the Roman god of the sea, who is identified with the Greek deity Poseidon, a son of ...
  6. science.nasa.gov

    Dec 9, 2024Encountering Neptune in 1989, NASA's Voyager mission completed humankind's first close-up exploration of the four giant outer planets of our solar system. Collectively, since their launch in 1977, the twin Voyager 1 and Voyager 2 spacecraft discovered that Jupiter, Saturn, Uranus, and Neptune were far more complex than scientists had imagined. There was a lot […]
  7. asc-csa.gc.ca

    Science. Astronomy. Solar system. Top of page Neptune. About Neptune. Details about Neptune; Type: Ice giant : Size (diameter) 49,244 km, or about 4 Earths: Mass: 1.0 × 10 26 kg, or about 17 Earths: ... Like the other giant planets in our solar system, Neptune does not have a solid surface. Scientists believe that the interior of the planet is ...
  8. science.gsfc.nasa.gov

    Neptune. Neptune is the eighth planet from the Sun, and receives only 1/900 of the sunlight received at Earth. Of the 4 giant planets, it radiates the most internal heat relative to what it receives from the Sun. ... It also has the strongest winds in the solar system, in excess of 800 miles per hour. A large storm, the Great Dark Spot, was ...
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