When the sky collapses
When the sky collapses
Discovered an immense crater under the ice of Greenland.
Our planet has suffered throughout history the cataclysmic visit of great asteroids, some of which caused disasters on a global scale and forever altered the course of life in the land. And although we like to think that we are talking about things from the remote past, the truth is that this threat is still alive, although the ability of our planet to "heal" the wounds and make them disappear makes us forget it. The last example of this comes from the frost Greenland.
Hand in hand with an international team of scientists led by the Museum of Natural History of Denmark (University of Copenhagen), we now get the evidence that under the ice of this great polar island, hidden by the glacier Hiawatha, there is a large impact crater, more than 30 kilometers in diameter, which allows us to assume that the person responsible should have between 1 and 1.5 kilometers. It is easy to imagine the cataclysm generated by something like that, which could have happened in relatively recent times. "It is exceptionally well preserved and that is surprising, because the ice of the glacier is an incredibly efficient erosive agent that would have quickly eliminated the footprints of the impact, but that means that this crater must be quite young from a geological point of view", explains Professor Kurt H. Kjær of the Geogenetics Center at the Museum.
And is that the estimates are very close to recent times, may even when Humanity was already present. The observed characteristics indicate that the impact occurred when the ice cover Greenland it had already been formed, which reduces the possible space of time between 3 million years and only 12,000, towards the end of the last ice age. And what is more intriguing, "we are inclined to think that the impact occurred in the most recent part of this time range", stresses Kjær."Humans may not have come to see the impact, but they may feel its consequences, like a climate change. Hurricane winds and earthquakes would occur within a radius of 500 km."
Although there is still a great uncertainty about when the impact occurred, which should be refined with new research, this creates fascinating questions. Could global climate change affect the young Humanity several tens or hundreds of thousands of years ago? Did it provoke in our ancestors any evolutionary change that could be detected in ancient human populations through DNA? The only thing we know for now is that in recent times "it rained fire" on the frozen lands of the North. And surely it was not the last time it happened.
The massive Greenland crater.
The radar observations allowed to reveal the impact footprint, covered by the polar ice caps.
Quartz grains with characteristics of planar deformation, indicative of a violent impact.
Illustration of the impact. The asteroid penetrated about 7 km into the earth's crust, creating a crater that initially would be 20 km wide, but collapsed and expanded in a matter of minutes, reaching its current dimensions, above 30.The crater under the ice of Greenland could arise in the time of humans
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