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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 ...
    • By the Numbers

      Neptune is the eighth and most distant planet from the Sun. It's the fourth largest, and the first planet discovered with math. ... Source: JPL Solar System Dynamics website. Page Updated: May 16, 2024. Return to top. The National Aeronautics and Space Administration. ... Responsible NASA Official for Science: Dana Bolles ...

    • Exploration

      1846: Using mathematical calculations, astronomers discover Neptune, increasing the number of known planets to eight. Neptune's largest moon, Triton, is found the same year. 1983: Pioneer 10 crosses the orbit of Neptune and becomes the first human-made object to travel beyond the orbits of the planets of our solar system. The spacecraft remains ...

    • Stories

      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,…

    • Solar System Home

      The solar system has one star, eight planets, five dwarf planets, at least 290 moons, more than 1.3 million asteroids, and about 3,900 comets. ... A real-time visualization of our solar system using planetary science data. NASA/JPL-Caltech. Featured Resources. ... Encountering Neptune in 1989, NASA's Voyager mission completed humankind's ...

    • Mercury

      Mercury is the smallest planet in our solar system and the nearest to the Sun. Mercury is only slightly larger than Earth's Moon. It's the fastest planet, zipping around the Sun every 88 Earth days.

    • Venus

      Venus is the second planet from the Sun, and the sixth largest planet. It's the hottest planet in our solar system. Venus is a cloud-swaddled planet and our nearest planetary neighbor.

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  4. 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 ...
  5. 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 ...
  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. science-reference.com

    Neptune has an extremely cold upper atmosphere, with temperatures reaching about 55 K(-218 C). However, the Neptunian surface is about 5400 K(5127 C). Neptune is characterized by extremely intense storms, just like the other 3 planets beyond the Asteroid Belt, as winds approach 600 m/s in speed at times.
  8. 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 ...
  9. May 11, 2023Space Science, Solar System and Planets, Neptune. Type. Other Multimedia, Websites. This site has facts, figures, images and links about the planet Neptune. Go to Website. National Aeronautics and Space Administration. NASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery.
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