Origin of Structures on the Moon's Surface

Physics

Scientific paper

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Scientific paper

THE difficulty raised by the Rev. O. Fisher (NATURE, February 26, p. 714) with regard to the origin of the moon by fission from the earth has been answered already in part in Sir George Darwin's own writings. The length of the day when earth and moon revolved once a day was calculated by him at first as about 5 hours, the figure used by Mr. Fisher. Afterwards, Darwin showed that taking solar tidal friction into account, this period should be reduced to something of the order of 2½ hours, when the two bodies would be almost in contact (see Darwin, ``Scientific Papers'', vol. ii., pp. 323, 364). It may not be amiss to quote here his cautious estimate of this result:-``The whole subject is full of difficulties, and the conclusions must necessarily remain very speculative''.

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