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The sizes and masses of many of the moons of Jupiter and Saturn are fairly well known due to numerous observations and interactions of the Galileo and Cassini orbiters; however, many of the moons with a radius less than ~100 km, such as Jupiter's Himalia, have far less certain masses. [5]
Apparent sizes of the moons of Mars, Deimos and Phobos, and the Moon as viewed from the surface of their respective planets (Mars' moons imaged by the Curiosity rover, 1 August 2013) Size comparison between Phobos, Deimos and the Moon (right) If viewed from Mars's surface near its equator, a full Phobos would look about one-third as big as a ...
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Size of this preview: 800 × 182 pixels. Other resolutions: 320 × 73 pixels ... English: Simulated comparison of view of earth-moon from Mars. Date: 2 March 2017:
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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.
Though differing in size and temperature, terrestrial planets of the Solar System were reported to have high Earth Similarity Index values – Mercury, Venus, Earth and Mars. Sizes to scale. The Earth Similarity Index (ESI) is a proposed characterization of how similar a planetary-mass object or natural satellite is to Earth. It was designed to ...
Eris,_Earth_&_Moon_size_comparison.png (729 × 490 pixels, file size: 453 KB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.