When Will Earth Lock To The Moon?

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Fraser - what size would a large metor/small asteroid have to be to alter the Mon's axis of rotation and/or period of rotation enough so we saw part/all of the other side?

Fraser - what size would a large metor/small asteroid have to be to alter the Mon's axis of rotation and/or period of rotation enough so we saw part/all of the other side?

Is it a valid speculation that the earth and the moon may have initially been locked shortly after formation of the moon.