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Of the Solar System's eight planets and its nine most likely dwarf planets, six planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally rounded; of these, all are covered by a crust of ice except for Earth's Moon and Jupiter's Io . [ 1 ]
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
The remaining objects of the Solar System (including the four terrestrial planets, the dwarf planets, moons, asteroids, and comets) together comprise less than 0.002% of the Solar System's total mass. [h] The Sun is composed of roughly 98% hydrogen and helium, [41] as are Jupiter and Saturn.
The Sun, planets, moons and dwarf planets (true color, size to scale, distances not to scale) The following outline is provided as an overview of and topical guide to the Solar System: Solar System – gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the ...
List of craters on Mars; List of mountains on Mars; List of rocks on Mars; List of valles on Mars; List of chasmata on Mars; List of plains on Mars; List of terrae on Mars; List of areas of chaos terrain on Mars; List of surface features of Mars seen by the Spirit rover; List of surface features of Mars seen by the Opportunity rover; see also ...
In an almost poetic twist, the moon is also the most reflective body in the solar system—reflecting almost 100 percent of the light that reaches it. It is a beacon in more ways than one. 4.
The Solar System also contains: Comets. List of periodic comets; List of near-parabolic comets; Small objects, including: Meteoroids; Interplanetary dust. Helium focusing cone, around the Sun; Human-made objects orbiting the Sun, Mercury, Venus, Earth, Mars, and Saturn, including active artificial satellites and space junk
Astronomers have discovered three previously unknown moons around Uranus and Neptune, the most distant planets in our solar system. The find includes one moon spotted orbiting Uranus — the first ...