‘Pristine’ extraterrestrial organic compounds found on meteorite may shed light on origin of life on Earth

By | October 28, 2020

Vice reports:

On a dark winter night in 2018, hundreds of people across the Great Lakes region witnessed a radiant meteor brighten the skies. Mere days after the fireball streaked overhead on that night in January, scientists were able to track down precious pieces of the ancient space rock using weather radar reports.

The scattered remnants of the object, known as the Hamburg meteorite, contain a “high diversity” of extraterrestrial organic compounds that are preserved “in a pristine condition,” according to a study published on Tuesday in the journal Meteoritics & Planetary Science. The finding can help shed light on the origin of life on Earth, which might have been spurred in part by the delivery of organic compounds inside meteorites like Hamburg.

Though it originally measured about a half-meter across and weighed 50 kilograms (110 pounds), the meteorite broke up into small chunks that landed on the frozen surfaces of Strawberry Lake and Bass Lake in Michigan.

The chilled environment kept the shards relatively free of earthly contamination, making them a valuable time capsule of the early solar system, said a team led by Philipp Heck, a curator at the Field Museum and associate professor at the University of Chicago.

“Because these first specimens of the meteorite were rapidly recovered from an icy surface, the time period for terrestrial alteration was short,” Heck and his colleagues said in the study. “An international consortium was formed to thoroughly characterize the meteorite while it was still fresh.”

“The studied rock fragments show no or little signs of terrestrial weathering,” the team noted.

The Hamburg meteorite belongs to a class of space rock called H4 chondrites, which were formed in the early solar system. These relics are often filled with the same organic (carbon-containing) compounds that proved essential in the emergence of life on Earth.

As a result, scientists think meteorites impacts may have contributed to our planet’s habitability to some degree, by seeding it with these key organic ingredients. [Continue reading…]

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