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s that of radius of the earth. The mass is close to 7. 342× 10kg, equivalent to 0. 0123 times that of the earth. The moon is the brightest celestial body in the night sky on earth (before the advent of artificial light sources). The moon revolves around the earth and rotates at the same time, with a period of 27. 3226 days, which happens to be a sidereal