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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. 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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