Ancient Earth hammered by double space impact (noticia en inglés)
18-03-2014. EL CAB EN LOS MEDIOS (BBC News)

We've all seen the films where an asteroid hurtles towards our planet, threatening civilisation. 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 neighbouring 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.

A handful of possible double impacts (or doublets) are already known on Earth, but Dr Jens Ormo says there are disputes over the precision of dates 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 Centre 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.

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Fuente: BBC News

 

Imágenes adicionales:

About 15% of near-Earth asteroids are binaries (créditos: BBC News).
Trilobites were among the most numerous inhabitants of Ordovician seas (créditos: BBC News).
The Clearwater East and West craters are the best known candidates for a double impact (créditos: BBC News).
 
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