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Ganymede is the largest moon of Jupiter and one of the largest moons in our solar system. It is scientifically important because it may harbor a subsurface ocean of water beneath its icy crust, making it a prime candidate in the search for potential extraterrestrial life.
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Apparent magnitude 4.61 (opposition) 4.38 (in 1951) Angular diameter 1.2 to 1.8 arcseconds Atmosphere Surface pressure 0.2–1.2 μPa (1.97×10–1.18×10 atm) Composition by volumemostly oxygen
Ganymede is a natural satellite of Jupiter and is the largest and most massive moon in the Solar System. Like Saturn's largest moon Titan, it is larger than the planet Mercury, but has somewhat less surface gravity than Mercury, Io, or Earth's Moon due to its lower density compared to the three. Ganymede orbits Jupiter in roughly seven days and is in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.