Are we in danger of losing the Moon? Maybe, in about 5 billion years or so. By then, the Moon could end up as it began — a ring of debris circling the Earth.

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  1. Short answer: No

    It's rather complicated.
    Bear with me.

    Presently the moon is tidally locked, and through momentum transfer (from the Earth to the moon) the moon is gradually receding from the Earth.

    This will continue until the Earth is tidally locked with the moon – in other words, the Earth's day will have slowed till it matches that of the Moon's orbital period.

    Granted, this will take some time.

    During all this time the Moon will be experiencing drag from interplanetary gas – give it a few billion years, and without any more angular momentum to be transferred from the Earth, the Moon will come spiralling in again.


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