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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 and slightly more massive, but denser and smaller, than fellow ice giant Uranus.
Dark, cold, and whipped by supersonic winds, ice giant Neptune is 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 discovery in 1846.
1 day ago · Neptune 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.
Mar 11, 2024 · Rn denotes Neptunian model radius, here defined to be 24,765 km. Neptunian Atmosphere.
May 16, 2024 · Neptune is the eighth and most distant planet from the Sun. It’s the fourth largest, and the first planet discovered with math.
Sep 25, 2019 · Neptune has an average distance of 2.8 billion miles/4.5 billion kilometers or 30 AU away from the Sun, being the furthest of the eight planets. Currently it is 29.4 AU away from Earth with its light taking up to 4 hours to arrive to us.
Size and Distance. With a radius of 15,299.4 miles (24,622 kilometers), Neptune is about four times wider than Earth. If Earth were the size of a nickel, Neptune would be about as big as a baseball. From an average distance of 2.8 billion miles (4.5 billion kilometers), Neptune is 30 astronomical units away from the Sun.