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Triton is large enough to have achieved hydrostatic equilibrium, but, uniquely for a large moon, has a retrograde orbit, suggesting it was a dwarf planet that was captured. Neptune also has seven known inner regular satellites, and eight outer irregular satellites. Pluto, a dwarf planet, has five moons.
Areocentric orbit (named after Ares): An orbit around the planet Mars, such as that of its moons or artificial satellites. For orbits centered about planets other than Earth and Mars and for the dwarf planet Pluto, the orbit names incorporating Greek terminology are not as established and much less commonly used:
Of the inner planets, Mercury and Venus have no natural satellites; Earth has one large natural satellite, known as the Moon; and Mars has two tiny natural satellites, Phobos and Deimos. The giant planets have extensive systems of natural satellites, including half a dozen comparable in size to Earth's Moon: the four Galilean moons , Saturn's ...
mission to study Jupiter's three icy moons Callisto, Europa and Ganymede, eventually orbiting Ganymede as the first spacecraft to orbit a satellite of another planet. [64] Europa Clipper: NASA: 14 October 2024 (launch) 11 April 2030 (planned) orbiter en route planned to orbit Jupiter and fly by Europa multiple times EUROPA-CL [46]
Montage of planets and some moons that the two Voyager spacecraft have visited and studied, still active in the 2020s they are heading out into interstellar space returning data from newly explored distances. Europa Clipper. Mission: mission to study Jupiter and Europa. Launched: 14 October 2024; Destination: Jupiter; Arrival: 11 April 2030 (en ...
The number of satellites in Earth's orbit has skyrocketed from about 1,000 in 2010 to more than 10,000 today. ... and the Chinese government — all to connect the entire planet to the internet. ...
McNaught has a hyperbolic orbit but within the influence of the inner planets, [9] is still bound to the Sun with an orbital period of about 10 5 years. [3] Comet C/1980 E1 has the largest eccentricity of any known hyperbolic comet of solar origin with an eccentricity of 1.057, [ 10 ] and will eventually leave the Solar System.
These lists contain the Sun, the planets, dwarf planets, many of the larger small Solar System bodies (which includes the asteroids), all named natural satellites, and a number of smaller objects of historical or scientific interest, such as comets and near-Earth objects.