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The moon is the only natural satellite of the earth and the fifth largest satellite in the solar system. it is the largest natural satellite ot a planet in the solar system relative to the size of its primary , having a quarter the diameter of earth and 1/81 it mass. the moon is the second densest satellite after lo, a satellite of jupiter. it is in synchronous rotation with earth, always showing the same face .it is the brightest object in the sky after the sun , although its surface is actually very darkk, with a similar reflectance to coal. the moon's current orbital distance , about thirty times the diameter of the earth, causes it to appear almost yhe same size in the sky as the sun allowing it to cover the sun nearly precisely in total solar eclipses.
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