Hidden under Greenland’s thick ice is a mysterious structure up to 31 km in diameter, related to an unknown alien object.

According to Space, researchers from the GLOBE Institute of the University of Copenhagen (Denmark) and the Swedish Museum of Natural History have discovered a structure that they suspect is a giant impact crater beneath Hiawatha’s thick ice layer. Greenland.

The Danish team took a sand sample from Hiawatha crater and heated it, using argon gas released from the grains to determine the impact event. Meanwhile, the team from Sweden took rock samples in another independent survey to determine the date based on the uranium traces of the mineral zircon.

Both surveys show that the time of the collision was 58 million years ago.

Research also shows that at the time of the disaster, Greenland was not an ice island but a tropical rainforest. The mysterious object, which they believe to be an asteroid, hit Earth with a force several million times stronger than an atomic bomb, leaving a giant crater, destroying part of Greenland and causing a global climate impact.

Scientists said they plan to continue research to determine the exact damage from the collision. But it is estimated that it will be a severe shock for the Earth just recovering from the Chicxulub disaster that killed the dinosaurs.

They also have not directly determined whether material from the alien attacker remained trapped in the impact crater, or how much of the asteroid may still be buried under the ice. Those are also the goals that subsequent research is aiming for.

Preliminary research has just been published in the journal Science.