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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 ...
With a diameter of about 5,270 kilometres (3,270 mi) and a mass of 1.48 × 10 20 tonnes (1.48 × 10 23 kg; 3.26 × 10 23 lb), Ganymede is the largest and most massive moon in the Solar System. [45] It is slightly more massive than the second most massive moon, Saturn's satellite Titan, and is more than
2015 – New Horizons spacecraft flies by Pluto, providing the first ever sharp images of its surface, and its largest moon Charon. [247] 2017 – 'Oumuamua, the first known interstellar object crossing the Solar System, is identified. [248] 2019 – Closest approach of New Horizons to Arrokoth, a KBO farther than Pluto. [249]
Parts-per-million chart of the relative mass distribution of the Solar System, each cubelet denoting 2 × 10 24 kg. This article includes a list of the most massive known objects of the Solar System and partial lists of smaller objects by observed mean radius. These lists can be sorted according to an object's radius and mass and, for the most ...
These four moons, discovered by Galileo Galilei and by Simon Marius in parallel, orbit between 400,000 and 2 million km, and are some of the largest moons in the Solar System. Irregular moons Himalia group: A tightly clustered group of prograde-orbiting moons with orbits around 11–12 million km from Jupiter [210] Carpo group
Most of them are quite small. Seven moons are large enough to be in hydrostatic equilibrium, including Titan, the second largest moon in the Solar System. Including these large moons, 24 of Saturn's moons are regular, and traditionally named after Titans or other figures associated with the mythological Saturn.
They are planetary-mass moons and among the largest objects in the Solar System. All four, along with Titan, Triton, and Earth's Moon, are larger than any of the Solar System's dwarf planets. The largest, Ganymede, is the largest moon in the Solar System and surpasses the planet Mercury in size (though not mass). Callisto is only slightly ...
Titan is the tenth-largest object known in the Solar system, including the Sun. [35] Before the arrival of Voyager 1 in 1980, Titan was thought to be slightly larger than Ganymede, [17] which has a diameter 5,262 km (3,270 mi), and thus the largest moon in the Solar System.