Mathematics – Logic
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.284..328r&link_type=abstract
Nature, vol. 284, Mar. 27, 1980, p. 328, 329. NSF-supported research.
Mathematics
Logic
4
Earth Surface, Earth-Moon System, Gamma Rays, Lunar Surface, Mass Transfer, Supernovae, Abundance, Earth Atmosphere, Escape Velocity, Gravitational Fields, Lunar Composition, Solar Radiation, Moon, Earth, Supernova, Iridium, Soils, Gamma Rays, Energy, Surface, Gases, Hypotheses, Temperatures, Theoretical Studies, Samples, Abundance, Comparisons, Atmosphere, Nitrogen Trioxide, Earth-Moon System, Transport
Scientific paper
Consideration is given to the possible indirect effects on the earth of a 10 to the 50th erg gamma ray flash from a supernova explosion at a distance of 30 light years or less. It is shown that, in contrast to the atmosphere-shielded earth surface, the lunar surface will absorb directly the approximately 10 to the 10th erg/sq cm of gamma rays incident on it, and become vaporized to a depth of 1 cm if the energy is deposited in less than a second or be ejected by a pressure pulse. Part of the vapor could then reach lunar escape velocity and be captured by the earth's gravitational field, filtering down through the atmosphere to the surface within several decades. Evidence of lunar surface vaporization or mass ejection resulting in mass transfer to the earth could consist of melted-recrystallized areas on the lunar surface, or of an overabundance of iriduim in terrestrial geological strata. Additional possible effects of a strong gamma-ray flash include ozone suppression in the atmosphere, leading to increased surface solar UV radiation, and climatic effects due to the presence of lunar particles, possibly leading to severe biological effects.
Ruderman Malvin
Truran Jame. W.
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