Meteorites and the Moon: Cosmic-ray ages and contaminants provide evidence that meteorites may come from the moon.

Considerable evidence of diverse kinds has accumulated during the last 6 years indicating that some or possibly most of the stone meteorites come from the moon. Included in these may well be the carbonaceous chondrites of the Orgueil type and this indicates that contamination of the moon with terrestrial water has occurred. This statement does not depend on the carbonaceous matter being of biotic origin. Models for the origin of the moon are consistent with the hypothesis that some contamination of this kind occurred. This conclusion is possible regardless of whether the meteorites come from the moon or not.