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What are Some Prominent Features of Neptune?

Neptune, the eighth planet from the Sun, boasts a stunning deep blue hue, a testament to its methane-rich atmosphere. It's home to supersonic winds and mysterious dark spots, akin to Jupiter's Great Red Spot. With 14 known moons and faint rings, Neptune's celestial dance is truly mesmerizing. What secrets might Neptune's icy depths be hiding? Join us to uncover more.
Michael Anissimov
Michael Anissimov
Michael Anissimov
Michael Anissimov

Neptune is a darkish-blue gas giant in the outer solar system. It orbits about 30 AUs (Earth-Sun distances) from the Sun, making a revolution every 165 years. Since Pluto was demoted to a dwarf planet in 2006, Neptune has been the outermost planet in the solar system.

Neptune was discovered in 1846 by the French astronomer Urbain Le Verrier, who inferred its existence by examining the orbit of Uranus. It was named after the Roman god of the sea, in keeping with all the other planets which were named after ancient gods.

Radio telescopes can be used to study the universe and celestial objects.
Radio telescopes can be used to study the universe and celestial objects.

Neptune has a volume of 57.7 Earths and a mass of 17.1 Earths. Its diameter is slightly less than four Earths. Like the other gas giants, Neptune is mainly made up of hydrogen gas. It gets its deep blue color from trace methane ices suspended in its atmosphere. Because its composition varies somewhat from Jupiter and Saturn, along with Uranus it is sometimes called an ice giant. Neptune is relevant to solar system dynamics because its gravitational pull stabilizes a 2nd asteroid belt in the outer solar system, of which Pluto is a member, the Kuiper belt.

Neptune has 13 known moons, including Triton, its best known satellite.
Neptune has 13 known moons, including Triton, its best known satellite.

Although Neptune is more massive than its sister planet Uranus, it is actually smaller, because it is more compact, and its core is slightly larger. Unlike Uranus, Neptune has some surface features, most prominently its Great Dark Spot, a long-lived storm similar to the Great Red Spot on Jupiter. Its more interesting cloud activity is partially attributable to the fact that Neptune produces its own internal heat, about 2.5 times that it receives from the Sun. Other storms on Neptune have been named Scooter and the Wizard's Eye.

Another characteristic making Neptune unique among the gas giants is the presence of high-level clouds which cast shadows onto an opaque cloud deck below. Neptune is the 2nd coldest planet in the solar system after Uranus, with −224 °C (−372 °F or 49 K) temperatures measured at the cloud tops in 1989. Neptune has some small, faint azure rings which were observed by the Voyager spacecraft when it made a flyby in 1989.

Michael Anissimov
Michael Anissimov

Michael is a longtime AllTheScience contributor who specializes in topics relating to paleontology, physics, biology, astronomy, chemistry, and futurism. In addition to being an avid blogger, Michael is particularly passionate about stem cell research, regenerative medicine, and life extension therapies. He has also worked for the Methuselah Foundation, the Singularity Institute for Artificial Intelligence, and the Lifeboat Foundation.

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Michael Anissimov
Michael Anissimov

Michael is a longtime AllTheScience contributor who specializes in topics relating to paleontology, physics, biology, astronomy, chemistry, and futurism. In addition to being an avid blogger, Michael is particularly passionate about stem cell research, regenerative medicine, and life extension therapies. He has also worked for the Methuselah Foundation, the Singularity Institute for Artificial Intelligence, and the Lifeboat Foundation.

Learn more...

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    • Radio telescopes can be used to study the universe and celestial objects.
      By: Route16
      Radio telescopes can be used to study the universe and celestial objects.
    • Neptune has 13 known moons, including Triton, its best known satellite.
      By: ordus
      Neptune has 13 known moons, including Triton, its best known satellite.