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The dwarf planet Pluto and its moon Charon are often described as a binary system in the Solar System, which orbit the Sun Main article: Binary asteroid When binary minor planets are similar in size, they may be called " binary companions " instead of referring to the smaller body as a satellite. [ 3 ]
Thus, the Sun occupies 0.00001% (1 part in 10 7) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly 1 millionth (10 −6) that of the Sun. Jupiter, the largest planet, is 5.2 AU from the Sun and has a radius of 71,000 km (0.00047 AU; 44,000 mi), whereas the most distant planet, Neptune, is 30 AU ...
For the giant planets, the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure. [ 11 ] Because Sedna and 2002 MS 4 have no known moons, directly determining their mass is impossible without sending a probe (estimated to be from 1.7x10 21 to 6.1×10 21 kg for Sedna [ 12 ] ).
Visual comparison of the sizes of Earth and the Moon (above right) and Pluto–Charon (below right). In astronomy, a double planet (also binary planet) is a binary satellite system where both objects are planets, or planetary-mass objects, and whose barycenter is external to both planetary bodies.
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 ...
Double planet: Also known as a binary planet. Two planetary-mass objects orbiting each other. OGLE-2017-BLG-0380Lb [2] Eccentric Jupiter: A gas giant that orbits its star in an eccentric orbit. HD 80606 b, HD 20782 b: Exoplanet: A planet that does not orbit the Sun, but a different star, a stellar remnant, or a brown dwarf. Proxima Centauri b ...
On April 4, 2024, four planets will align on the same side of the sun as Earth. According to Star Walk , an astronomy app and developer, Venus, Mars, Saturn and Neptune will be visible.
The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.