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Traces of ancient tides

30.04.2001

In southern Africa, in the valley of the Sheba River, layered deposits were found that arose 3,2 billion years ago as a result of tides (then this area was on the ocean).

Since the tides arise under the influence of the Moon's attraction, geologists calculated from the thickness of the layers and the distance between them that the Moon then revolved around the Earth in about 20 days (now - in 27). Moreover, the study of the South African layers suggests that the Moon's orbit was then closer to a circle than to an ellipse, which means that, most likely, the Moon was not an independent body captured by the Earth.

The new find supports the hypothesis that our satellite is a piece of the Earth knocked out of it during a powerful collision with some other celestial body.

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