Ancient Earth hammered by double space impact (news in English) - 03-18-2014. THE CAB IN THE MEDIA (BBC News)

We've seen the films where asteroid hurtles towards our planet, threatening civilization. What's less well known is that menacing space rocks sometimes come in twos. Researchers have outlined some of the best evidence yet for a double space impact, where an asteroid and its moon apparently struck Earth in tandem. Using tiny, plankton-like fossils, they established that neighboring craters in Sweden are the same age - 458 million years old.

Details of the work were presented at the 45th Lunar and Planetary Science Conference in The Woodlands, Texas, and the findings are to be published in the Meteoritics and Planetary Science journal.

However, other scientists cautioned that seemingly contemporary craters could have landed weeks, months or even years apart. p>

A handful of possible double (or doublets) are already known on Earth, but Dr Jens Ormo says there are disputes over the accuracy of data assigned to these craters.

"Double impact craters Must be of the same age, otherwise they could just be two craters right next to each other, "the researcher from the Center for Astrobiology in Madrid, Spain, told BBC News.

Dr Ormo and his colleagues studied Two craters called Lockne and Malingen, which lie about 16km apart in northern Sweden. Measuring about 7.5km wide, Lockne is the bigger of the two structures; Malingen, which lies to the south-west, is about 10 times smaller.



Fuente: BBC News


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