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It is slightly more massive than the second most massive moon, Saturn's satellite Titan, and is more than twice as massive as the Earth's Moon. It is larger than the planet Mercury, which has a diameter of 4,880 kilometres (3,030 mi) but is only 45 percent of Mercury's mass. Ganymede is the ninth-largest object in the solar system, but the ...
It is the only satellite in the Solar System known to possess a magnetosphere, likely created through convection within the liquid iron core. [ 43 ] Ganymede is composed primarily of silicate rock and water ice, and a salt-water ocean is believed to exist nearly 200 km below Ganymede's surface, sandwiched between layers of ice. [ 44 ]
(See Other moons of Earth and Quasi-satellite.) Mars has two known moons , Phobos and Deimos ("fear" and "dread", after attendants of Ares , the Greek god of war, equivalent to the Roman Mars). Searches for more satellites have been unsuccessful, putting the maximum radius of any other satellites at 90 m (100 yd).
A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another natural satellite). Natural satellites are colloquially referred to as moons , a derivation from the Moon of Earth .
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Instruments; GALA: GAnymede Laser Altimeter: JANUS: Jovis, Amorum ac Natorum Undique Scrutator: J-MAG: Juice-MAGnetometer: MAJIS: Moons And Jupiter Imaging Spectrometer
Trackers worldwide can also call 1-877-HI-NORAD (1-877-446-6723) on Dec. 24 to ask live operators about Santa's location from 6 a.m. to midnight MST. When does Google's Santa tracker go live?
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