An unlucky day for our planet: two meteors hit ancient Earth at the same time.
Researchers at the University of Gothenburg have identified a globally unique double crater in Sweden. The meteorite twin strike occurred around 460 million years ago.
One of the craters is significantly larger than the other, with a diameter of 7.5 kilometres. The smaller crater is located 16 kilometres from the first, and has a diameter of 700 metres.
The two meteorite impacts were not the only ones to strike Earth at this time. "Around 470 million years ago, two large asteroids collided in the asteroid belt between Mars and Jupiter, and many fragments were thrown off in new orbits. Many of these crashed on Earth, such as these two in Jämtland," says Erik Sturkell, Professor of Geophysics at the University of Gothenburg.
You can find out more about this era of meteorite impacts by reading the full story here: egu.eu/6QO3GV