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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.
The Moon is Earth's only natural satellite, orbiting at an average distance of 384 399 km (238,854 mi; 30 Earths across).It faces Earth always with the same side.This is a result of Earth's gravitational pull having synchronized the Moon's rotation period with its orbital period (lunar month) of 29.5 Earth days.
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 ...
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.
The Earth seen from Apollo 17.jpg FullMoon2010.jpg Triton moon mosaic Voyager 2 (large).jpg: Author: Apollo 17 Picture of the Whole Earth: NASA. Telescopic Image of the Full Moon: Gregory H. Revera Image of Triton: NASA/JPL/USGS
Io (/ ˈ aɪ. oʊ /), or Jupiter I, is the innermost and second-smallest of the four Galilean moons of the planet Jupiter.Slightly larger than Earth's moon, Io is the fourth-largest moon in the Solar System, has the highest density of any moon, the strongest surface gravity of any moon, and the lowest amount of water by atomic ratio of any known astronomical object in the Solar System.
Size of this preview: 800 × 540 pixels. ... Moon, and Earth. Scale: Approximately 29km per pixel. Date: 20 March 2015, 03:01:46: Source: The Earth seen from Apollo ...
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 ...