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Sep 15, 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...
Sep 17, 2024 · Learn about Neptune, the last and darkest planet in our solar system. Find out how it's similar to Uranus, how long it takes to orbit the sun, and what its rings and moons look like.
Sep 15, 2024 · The atmosphere. Like the other giant planets, Neptune’s outer atmosphere is composed predominantly of hydrogen and helium. Near the one-bar pressure level in the atmosphere, these two gases contribute nearly 98 percent of the atmospheric molecules. Most of the remaining molecules consist of methane gas.
Sep 20, 2024 · The Lockheed P-2 Neptune (designated P2V by the United States Navy prior to September 1962) is a maritime patrol and anti-submarine warfare (ASW) aircraft. It was developed for the US Navy by Lockheed to replace the Lockheed PV-1 Ventura and PV-2 Harpoon, and was replaced in turn by the Lockheed P-3 Orion.
Sep 15, 2024 · Neptune is the only giant planet that is not visible without a telescope. Having an apparent magnitude of 7.8, it is approximately one-fifth as bright as the faintest stars visible to the unaided eye. Hence, it is fairly certain that there were no observations of Neptune prior to the use of telescopes.
5 days ago · This simulation shows the orbits of Uranus (inner circle) and Neptune (outer circle) around the Sun (center star). As Uranus catches up to Neptune in its orbit, Neptune's gravity pulls it along and makes it move faster.
Sep 17, 2024 · NASA science games, articles and activities for kids.
