A team of researchers with members from the U.S., Sweden and Switzerland studying a meteorite found in a Swedish quarry is reporting that the rock is unlike anything else ever found. In their paper published in Earth and Planetary Science Letters, they suggest the meteorite might just be evidence of a collision between two asteroids millions of years ago.
For several years scientists have debated the reason behind a lull, then sudden resurgence of biodiversity on planet Earth a little over 500 million years ago—some suggest the resurgence was due to a sudden major increase in the number of meteorite impacts. The increase, theorists suggest, came about due to an impact between two asteroids, likely somewhere between Jupiter and Mars. Debris from the remains of one of those objects is believed to be the source of L chondrites, which have been found in many places around the globe. But, until now, no evidence of the other asteroid has been found on Earth, putting a damper on the theory—some have suggested the second asteroid simply vaporized on impact. The meteorite found in Sweden has reignited interest, however, because it’s possible it is a piece of that second asteroid (because it appears to have been part of the same meteor shower as the L chondrites), which if true, will add a lot of credence to the entire theory that seeks to explain the sudden resurgence of life during the early part of the Ordovician period.
Read more at: Phys.org