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  2. Callisto (moon) - Wikipedia

    en.wikipedia.org/wiki/Callisto_(moon)

    Callisto (/ k ə ˈ l ɪ s t oʊ / kə-LIST-oh), or Jupiter IV, is the second-largest moon of Jupiter, after Ganymede.In the Solar System it is the third-largest moon after Ganymede and Saturn's largest moon Titan, and nearly as large as the smallest planet Mercury.

  3. File:Callisto, Earth & Moon size comparison.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Callisto,_Earth_&_Moon...

    Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221.; The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies.

  4. Galilean moons - Wikipedia

    en.wikipedia.org/wiki/Galilean_moons

    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 smaller than Mercury in size; the smaller ones, Io and Europa, are about the size of the Moon. The three inner moons — Io, Europa, and Ganymede — are in a 4:2:1 orbital resonance with each other.

  5. Planetary-mass moon - Wikipedia

    en.wikipedia.org/wiki/Planetary-mass_moon

    The distinction between a satellite and a classical planet was not recognized until after the heliocentric model of the Solar System was established. When in 1610 Galileo discovered the first satellites of another planet (the four Galilean moons of Jupiter), he referred to them as "four planets flying around the star of Jupiter at unequal intervals and periods with wonderful swiftness."

  6. List of Solar System objects by size - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System...

    The size of solid bodies does not include an object's atmosphere. For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets , the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure.

  7. Planetary-mass object - Wikipedia

    en.wikipedia.org/wiki/Planetary-mass_object

    Planetary-mass satellites larger than Pluto, the largest Solar dwarf planet. The three largest satellites Ganymede, Titan, and Callisto are of similar size or larger than the planet Mercury; these and four more – Io, the Moon, Europa, and Triton – are larger and more massive than the largest and most massive dwarf planets, Pluto and Eris.

  8. The Scale of the Universe - Wikipedia

    en.wikipedia.org/wiki/The_Scale_of_the_Universe

    Average size of an atom's nucleus 10 −14 meters — Uranium nucleus — 1.5 × 10 −14 meters Picometer: 10 −12 meters 10 −12 meters Gamma ray wavelength 10 −12 meters 10 −12 meters Electron compton wavelength: 2 × 10 −12 meters — Helium atom 3.1 × 10 −11 meters 2.5 × 10 −11 meters Hydrogen atom 2.5 × 10 −11 meters 3.1 ...

  9. Natural satellite - Wikipedia

    en.wikipedia.org/wiki/Natural_satellite

    Size comparison of Earth and the Moon There is no established lower limit on what is considered a "moon". Every natural celestial body with an identified orbit around a planet of the Solar System , some as small as a kilometer across, has been considered a moon, though objects a tenth that size within Saturn's rings, which have not been ...