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  1. 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 ...
  2. science.nasa.gov

    Science Mission Directorate

    https://science.nasa.gov › neptune

    Dark, cold and whipped by supersonic winds, giant Neptune is the eighth and most distant major planet orbiting our Sun. More than 30 times as far from the Sun as is Earth, Neptune is not visible to the naked eye. Neptune was the first planet located using math. Get the Facts
    • Neptune

      Neptune has a thick, windy atmosphere. Time on Neptune. One day on Neptune goes by in 16 hours. Neptune has such a long journey around the Sun it takes 165 Earth years to go around once. That's a long year! Neptune's Neighbors. Neptune has 16 moons. Neptune is the eighth and most distant planet from the Sun.

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  4. solarsystem.nasa.gov

    NASA's real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system. ... More than 30 times as far from the Sun as Earth, 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 ...
  5. britannica.com

    Dec 14, 2024Neptune is almost four times the size of Earth but slightly smaller than Uranus, which makes it the smallest in diameter of the four giant, or Jovian, planets.It is more massive than Uranus, however, having a density roughly 25 percent higher. Like the other giant planets, Neptune consists primarily of hydrogen, helium, water, and other volatile compounds, along with rocky material, and it has ...
  6. solarsystem.nasa.gov

    NASA's real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system. ... Neptune orbits our Sun, a star, and is the eighth planet from the Sun at a distance of about 2.8 billion miles (4.5 billion kilometers). 03 Short Day, Long Year
  7. nineplanets.org

    - Neptune is 30 times farther than Earth's orbit from the sun. - The Sun is 900 times dimmer on Neptune than on Earth. - Most languages use some variant of the name "Neptune" for the planet. In Chinese, Vietnamese, Japanese and Korean, the planet's name was translated as "sea king star" while in Mongolian it is called Dalain Van.
  8. airandspace.si.edu

    Neptune, also known as the Blue Giant for its large size and vivid color, is the outermost planet in our Solar System. It joins Uranus, Saturn, and Jupiter as one of the giant planets. Giant planets are unimaginably huge, stunningly beautiful, and sometimes a little weird.

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    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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