Undoubtedly, the asteroids have always been a threat to Earth, well now that millions of years ago. Without going any further, in recent days we have witnessed the passage of a few others to a more or less close to our planet away, and as long as this situation occurs are rated concrete, present and future risks around a impact.
The point is that the past always gives us useful information about what can happen at any given time if you could not avoid a collision with Earth asteoride. Without going any further, we have one last example of this.
suffered Earth 458 million years ago a double asteroid impact, which is the origin of visible craters in Sweden today. According to an international team of scientists, led by Jens Ormo, Center for Astrobiology (CAB-INTA-CSIC), 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 has been published in ‘Scientific Reports’ aims as ‘signature’ this event –a central Sweden 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 altered sediments by an impact shock. They have also studied the halo ring –a ejecta debris thrown by violenta– break that should land, according to their studies, up to tens of kilometers away from the inner crater.
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