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The Moon is Earth's only natural satellite and is quarter the size of the Earth.
The Moon's gravity is around 1/6th of the Earth's gravity.
The gravitational field on the Moon is measured by the radio signals known as "Doppler shift".
The Moon is the only celestial body that is at the distance of 384400 km and is closest to the Earth.
Moon is claimed to around approximately 4.53 billion old.
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