Falling temperatures, blowing snow and dangerous travel conditions

MPR News helps you turn down the noise and build shared understanding. Turn up your support for this public resource and keep trusted journalism accessible to all. 

Turn Up Your Support

Scientists say that in a Swedish quarry, they've uncovered a meteorite unlike any other documented on the planet.

Its chemical makeup is unique among the 50,000 meteorites known on Earth, as Birger Schmitz of Sweden's Lund University tells The Two-Way. "This does not resemble anything ... even if we look at the big types that exist today and look at the broad ranges, this one falls completely outside of everything," he says.



What's more, the "mysterious object," which is about the size of a tennis ball, could "lead to a better understanding of possible large-scale astronomical perturbations affecting both Earth and the solar system," the scientists 

wrote in a newly published paper in Nature Communications

But before we get to those lofty heights — this story actually begins in a trash pile.

Twenty-four years ago in southern Sweden, at the dump pile of a quarry where workers cut into ancient seafloor to make tiles, Schmitz says they noticed unusual black dots on a stone. It turned out to be a meteorite. Since then, scientists have collaborated with the quarry workers to extract over 100 of the meteorites.

Until this latest discovery, the meteorites found at this site were all a type called ordinary chondrites. Ordinary chondrites represent 85 percent of all meteorites found on Earth, and all 85 percent originate from the same parent asteroid, broken into smaller pieces following a major collision.

Schmitz says that there are indications "that there was a smaller body hitting the bigger one, and they must have met in some sort of head-on collision, otherwise the energy would not be that high." For the past two decades, the team had been expecting to find a second type of meteorite sample originating from the smaller body.

As the years went by, "we shrugged our shoulders ... it started to become very boring," Schmitz says. A new batch came in from the quarry, and he handed it over to a student. But then:

Schmitz explains that all previously known meteorites have a unique combination of chromium and oxygen isotopes that form a unique "fingerprint."

But as you can see on this chart, this sample (Ost 65) falls outside all known combinations.

Schmitz adds that scientists think this meteorite is from the same collision as the others in the quarry because of its level of cosmic ray exposure, which measures "the amount of time a meteorite has been flying around in space as a small object." This supports the claim that all of the meteorites at the site were formed during a single event.

He says that the discovery could have broader significance:

The object may be the first documented "extinct" meteorite — meaning the parent body was "consumed by collisions," according to the paper.


It argues that this could be a window into the history of the solar system: "Apparently there is potential to reconstruct important aspects of solar system history by looking down in Earth's sediments, in addition to looking up at the skies."  Copyright 2019 NPR. To see more, visit https://www.npr.org.

Science

Scientists say that in a Swedish quarry, they've uncovered a meteorite unique among the 50,000 known on Earth today. They say it could hold clues about the history of the solar system.

Scientists say they've unearthed a completely new kind of meteorite

Go Deeper.

Like this?