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27 November 2013 12:59 pm ,
Vol. 342 ,
The new head of the National Center for Science Education promises to "fight the good fight" against attacks on...
Analyses of the H7N9 strains isolated from four new cases show that the virus is evolving rapidly, heightening anxiety...
In 2009, Jack Szostak shared a Nobel Prize for his part in discovering the role of telomeres, the end bits of...
Science has exposed a thriving academic black market in China involving shady agencies, corrupt scientists, and...
Paper-selling agencies flourish in the aura of reputable businesses. For some scientists, it may be difficult to tell...
Featuring the first lunar rover in 40 years, Chang'e-3 is seen as an important milestone on China's quest to send a...
Data collected by satellites and floating probes have chronicled a 2-decade rise in the temperature and thickness of a...
Cholesterol, the artery-clogging molecule that contributes to cardiovascular disease, has another nasty trick up its...
- 27 November 2013 12:59 pm , Vol. 342 , #6162
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ScienceShot: A Well-Preserved Meteor Impact
22 July 2010 2:00 pm
At only 16 meters deep and 45 meters wide, you wouldn't call the Kamil Crater in the southwest corner of Egypt "Deep Impact". Indeed, there are much more massive and impressive meteor craters scarring the Earth. Yet this small but perfectly preserved depression, discovered in 2009 during a Google Earth survey, is a rare beauty. There are currently 176 known craters on Earth's surface, of which only 15 are less than 300 meters wide—but all of these small craters have rapidly eroded and lost most of their original features. The Kamil Crater, however, has been well preserved, with the radial streaks of ejecta thrown out during impact still visible. And that's giving scientists a unique opportunity to study the characteristics of small-scale meteor impacts, researchers report online today in Science. The crater is in such pristine condition because it is geologically young (current estimates put the age at less than 5000 years) and because it escaped significant weathering, as it formed when extremely arid conditions were already prevalent in this remote part of Egypt. Craters like this one are typically found on planetary bodies in the Solar System that don't have atmospheres and therefore no weather systems to erode them.
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