The Moon isearth moon scale copy the fifth largest natural satellite in the Solar System with a diameter of about 2,160 mi (3,476 km), somewhat more than 1/4 the earth’s diameter. The moon has about 1/81 the mass of the earth and is 3/5 as dense. One theory is that the Moon was once a part of the earth that broke away following a collision with a huge object in the Earth’s relatively young days

 

 

 

 

Moon, Sun & Earth Credit: BBC

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