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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, giant Neptune is the eighth and most distant major planet orbiting our Sun. More than 30 times as far from the Sun as Earth, Neptune is not visible to the naked eye.
Sep 27, 2024 · Neptune, 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 was discovered on September 23, 1846. It is the second planet to be found using a telescope. Although Johann Gottfried Galle and Heinrich L...
- Neptune has 14 moons (natural satellites). Before Voyager 2's flyby of the planet, Neptune's only known moons were Triton and Nereid. Neptune's moo...
- Neptune’s outer atmosphere is composed predominantly of hydrogen and helium, contributing to 98 percent of the atmospheric molecules. Most of the r...
- Neptune is the only giant planet that is not visible without a telescope. It has an apparent magnitude of 7.8 and is approximately one-fifth as bri...
- Neptune’s color is a very vivid, bright blue, presumably an effect of the presence of methane and an unidentified atmospheric gas. With a small tel...
Orbit and Rotation. One day on Neptune takes about 16 hours (the time it takes for Neptune to rotate or spin once). And Neptune makes a complete orbit around the Sun (a year in Neptunian time) in about 165 Earth years (60,190 Earth days). Sometimes Neptune is even farther from the Sun than dwarf planet Pluto.
Neptune is the eighth and farthest planet from the Sun in the Solar System. It is an ice giant. It is the fourth-largest planet in the system. Neptune's mass is 17 times Earth 's mass and a little bit more than Uranus ' mass. Neptune is denser and smaller than Uranus.
Sep 25, 2019 · Learn about Neptune, the fourth largest and the farthest planet of the Solar System, with the most powerful wind speeds and the smallest ice giant. Find out how it was discovered by mathematical predictions, what it is made of, how many rings and moons it has, and more.
Sep 21, 2022 · See the first image of Neptune's rings in decades and the brightest moon Triton in infrared light. Learn about the ice giant's methane clouds, atmospheric circulation, and mysterious vortex.
