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Size comparison of Earth, Moon and Callisto Near-IR spectra of dark cratered plains (red) and the Asgard impact structure (blue), showing the presence of more water ice (absorption bands from 1 to 2 μm) [50] and less rocky material within Asgard.
The Earth seen from Apollo 17.jpg FullMoon2010.jpg Callisto.jpg: Author: Apollo 17 Picture of the Whole Earth: NASA. Telescopic Image of the Full Moon: Gregory H. Revera Global View of Callisto: NASA/JPL/DLR (German Aerospace Center)
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.
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.
Io (1.9 nbar) and Callisto (26 pbar) have very thin atmospheres, but still enough to have collisions between atmospheric molecules. Other planetary-mass moons only have exospheres at most. [26] Exospheres have been detected around Earth's Moon, Europa, Ganymede, [26] Enceladus, [27] Dione, [28] and Rhea. [29]
Size comparison of Europa (lower left) with the Moon (top left) and Earth (right) Europa is slightly smaller than the Earth's moon . At just over 3,100 kilometres (1,900 mi) in diameter , it is the sixth-largest moon and fifteenth-largest object in the Solar System .
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 × 10-11 meters
Size comparison of Earth and the Moon. ... including half a dozen comparable in size to Earth's Moon: ... Callisto: Titan: Mercury: 3,000–4,000 Moon: Io