Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.255..607m&link_type=abstract
Nature, vol. 255, June 19, 1975, p. 607-609.
Astronomy and Astrophysics
Astronomy
55
Cold Weather, Cosmic Dust, Cosmology, Milky Way Galaxy, Astronomical Models, Earth Surface, Glaciology, Hydrogen Clouds, Hypotheses, Ice Formation, Planetary Evolution, Solar System, Spiral Galaxies
Scientific paper
The present work examines the hypothesis that the passage of the solar system through a dust lane bordering a spiral arm of the Galaxy may cause a temporary variation of the sun's radiation and thereby lead to an ice epoch on earth. Calculations show that the passage of the solar system through very dense clouds could produce conditions leading to a brightening of the sun, an increase in precipitation on earth, and consequent onset of an ice age. It can be estimated that since its origin, the sun has passed through a spiral arm some 50 times in all, and rough estimates of time and duration of the passages agree qualitatively with the general picture of the ice age periods.
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