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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.
Earth's atmosphere contains 78% nitrogen and 21% oxygen, which is the result of the presence of life. [104] [105] The planet has a complex climate and weather system, with conditions differing drastically between climate regions. [106] The solid surface of Earth is dominated by green vegetation, deserts and white ice sheets.
Contents. Atmosphere of Jupiter. The atmosphere of Jupiter is the largest planetary atmosphere in the Solar System. It is mostly made of molecular hydrogen and helium in roughly solar proportions; other chemical compounds are present only in small amounts and include methane, ammonia, hydrogen sulfide, and water.
Neptune photographed by Voyager 2 in August 1989. An ice giant is a giant planet composed mainly of elements heavier than hydrogen and helium, such as oxygen, carbon, nitrogen, and sulfur. There are two ice giants in the Solar System: Uranus and Neptune. In astrophysics and planetary science the term "ice" refers to volatile chemical compounds ...
The "Great Dark Spot," a storm in Neptune's atmosphere, and the accompanying bright smudge of clouds are captured by the NASA Voyager 2 spacecraft less than five days before its closest approach ...
Geology portal. v. t. e. The geology of solar terrestrial planets mainly deals with the geological aspects of the four terrestrial planets of the Solar System – Mercury, Venus, Earth, and Mars – and one terrestrial dwarf planet: Ceres. Earth is the only terrestrial planet known to have an active hydrosphere.
As neutral hydrogen and nitrogen escape from Triton's atmosphere, they form a large neutral cloud in orbit around Neptune called the Triton torus. The modelled rate of escape of hydrogen, both atomic and molecular, is about 7 × 10 25 particles per second; nitrogen escape rates are inferred to be 2-3 times lower. [ 19 ]
Triton dominates the Neptunian moon system, with over 99.5% of its total mass. This imbalance may reflect the elimination of many of Neptune's original satellites following Triton's capture. [4][5] Triton (lower left) compared to the Moon (upper left) and Earth (right), to scale. Triton is the seventh-largest moon and sixteenth-largest object ...