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In principle, the exosphere covers distances where particles are still gravitationally bound to Earth, i.e. particles still have ballistic orbits that will take them back towards Earth. The upper boundary of the exosphere can be defined as the distance at which the influence of solar radiation pressure on atomic hydrogen exceeds that of Earth's ...
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 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 smallest of these, Kepler-42d, is about the size of Mars with a radius of only 0.57 times that of Earth. Not long ago, in Dec. of 2011, the Kepler team announced the discovery of Kepler-20e and Kepler-20f -- the first Earth-size planets ever found outside the solar system.
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English: Rough comparison of the sizes of Earth and Pluto. Source Created from File:The Earth seen from Apollo 17.jpg and File:NH-Pluto-color-NewHorizons-20150713-full.png .
The planet is about the size of Venus, so slightly smaller than Earth, and may be temperate enough to support life, the researchers said. Dubbed Gliese 12 b, the planet takes 12.8 days to orbit a ...
Original file (3,000 × 2,601 pixels, file size: 1.35 MB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.