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A planet that matches ours in sizeIts beauty in the
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aphelion appears asteroids astronomers atmos atmosphere attraction axis belts body canals changes Chart clouds color comet constellations course craters day and night Deimos diameter disk E. E. Barnard earth edge effect equator Eros evidence existence face fact FELIX GRAS force of gravity habitability half heat hemisphere imagination immense inhabitants jovian jovian planets Jupiter Jupiter's less light lunar globe Mars Mars's mass mean density mean distance Menippe Mercury miles moon moon's motion mountain nearer nearly Neptune observations Observatory orbit original Percival Lowell perhaps perihelion phenomenon phere Phobos planet planetary pletely polar caps present probably Prof reason regions remarkable resemblance revolution right ascension rotation satellites Saturn Saturn's rings Schiaparelli seas seen side snow solar nebula solar system space spot stars sun's sunlight surface telescope temperature terrestrial terrestrial planets theory tion Uranus vapor variation velocity Venus Venus's visible volcanic