illustration of a binary asteroid WM Keck Observatory-Lynette Cook
Madrid. (Europa Press) .- An international team of scientists, led by Jens Ormo, Center for Astrobiology (CAB-INTA-CSIC), has determined that, about 458 million years ago, the Earth suffered a double impact of asteroid , which is the origin of the visible craters in Sweden today.
As they have told the experts, this event might be “one of the greatest cosmic catastrophes” in the history of the Solar System. That impact caused the break and scatter asteroids big chunks of rock. Two of these pieces crashed in shallow seas that covered the current Scandinavia, causing uplift of the crust.
This work, which has been published in Scientific Reports , points as a ‘signature’ of this event central Sweden-to about 20 kilometers south of the city of Oestersund- specifically, Lockne crater 7.5 kilometers and close to another crater known as Malingen. They say the crater Lockne was created by an object about 600 meters long, while the Malingen measured 150 meters.
The study supports the suspicion that long, related these craters, only 16 kilometers away, with an “extremely rare” event space caused by asteroids that travel in pairs. Ormo and his team have carried out a hole in the Swedish craters, for traces of sediment disturbed by a shock impact.
have also studied the ejecta halo-a ring of debris thrown violently that should break the land, according to their studies, up to tens of kilometers away from the inner crater.
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