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Science 11 July 1997:
Vol. 277. no. 5323, pp. 183 - 184
DOI: 10.1126/science.277.5323.183
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Research News

PALEOCLIMATOLOGY:
Upstart Ice Age Theory Gets Attentive But Chilly Hearing

Richard A. Kerr

For decades, researchers thought the ice ages were driven by cyclical changes in the elliptical shape of Earth's orbit about every 100,000 years. But on page 215, a new theory suggests a different mechanism: changes in the inclination of Earth's orbit relative to the plane of the solar system that dip the planet into a climate-altering cloud of cosmic dust.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)