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Smaller asteroid may have killed dinosaurs
Honolulu, April 11, 2008 A scientist in Hawaii says the asteroid implicated in the extinction of dinosaurs was much smaller than previously suggested. Francois Paquay of the University of Hawaii Manoa has developed a new tool using variations of osmium isotope composition in the marine sediment record to estimate the size of asteroid impacts, the university said Thursday in a release. The findings are published in the journal Science. Paquay said sediment shows the asteroid that created Chicxulub crater off the coast of Mexico was about 2.5 miles wide -- less than half the size that researchers had previously suggested, the Los Angeles Times reported. The researchers estimate the size of the asteroid that created the 63-mile-wide Popigai crater in Siberia at about 1.7 miles across. Previous estimates had put that asteroid at about 2.5 miles across. Community Email This Article Comment On This Article Related Links Asteroid and Comet Impact Danger To Earth - News and Science
The Tunguska Meteorite As A Warning From Outer Space
Moscow (RIA Novosti) Mar 09, 2008Almost a century ago, on June 17 (30), 1908, a massive explosion occurred near the Podkamennaya Tunguska River, in what is now Russia's Krasnoyarsk Territory, Central Siberia. |
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