The great-circle pattern of large circular maria - Product of an earth-moon encounter

Details The great-circle pattern of large circular maria - Product of an earth-moon encounter The great-circle pattern of large circular maria - Product of an earth-moon encounter

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...12...55m&link_type=abstract

The Moon, vol. 12, Jan. 1975, p. 55-62.

Astronomy and Astrophysics

Astronomy

2

Circles (Geometry), Earth-Moon System, Lunar Evolution, Lunar Maria, Lunar Photography, Weightlessness, Astronomical Models, Gravitational Effects, Lunar Core, Lunar Surface, Two Body Problem

Scientific paper

The circular maria - Orientale, Imbrium, Serenitatis, Crisium, Smythii, and Tsiolkovsky - lie nearly on a lunar great circle. This pattern can be considered the result of a very close, non-capture encounter between moon and earth early in solar-system history. Of critical importance in analyzing the effects of such an encounter is the position of the weightlessness limit of the earth-moon system which is located at about 1.63 earth radius, measured from the center of earth to center of moon. Within this weightlessness limit, material can be pulled from the lunar surface and interior by earth's gravity and either escape from the moon or be redistributed onto the lunar surface.

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