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Does our moon have a moon?

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The Moon is, after Jupiter's satellite Io, the second-densest satellite in the Solar System among those whose densities are known. The Moon is thought to have formed about 4.51 billion years ago, not long after Earth. Moon. Designations Sidereal rotation period 27.321661 d (synchronous) Equatorial rotation velocity 4.627 m/s 41 more rows
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