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The meteor that fell in Great Britain could solve the mystery of the Earth's water
2022-11-17 12:55:34 / MISTERE&KURIOZITETE
Water covers three-quarters of the Earth's surface and was crucial to the emergence of life, but its origin remains a topic of active debate among scientists.
But a 4.6-billion-year-old meteorite that fell on a road in Gloucestershire, UK last year has provided some of the most compelling evidence to date that water arrived on Earth from asteroids in the outer solar system.
The Winchcombe meteorite, one of the "most pristine" available for analysis, offered scientists "a fascinating look back in time at the original composition of the solar system 4.6 billion years ago", said Dr Ashley King, a researcher at the History Museum in London. and author of a paper on the space rock.
A prevailing theory is that Earth was barren when it formed, as the inner solar system was too hot and water condensed.
The boundary of the region where ice could form in the early solar system is known as the frost line and is located in the modern asteroid belt.
Scientists think water may have arrived on Earth later, raining down on icy, high-impact meteoroids.
Megjithatë, ekzistojnë teori konkurruese, duke përfshirë se uji u soll nga kometa - të bëra kryesisht nga akulli dhe pluhuri - ose trupa të tjerë të ngjashëm.
Analiza e fundit i shton peshë teorisë se asteroidët dhanë një kontribut kryesor në ujin në Tokë.
Pjesa më e madhe e meteorit Ëinchcombe u gjet vetëm disa orë pasi ai ndriçoi Britaninë e Madhe në shkurt 2021 gjatë bllokimit.
Një nga pjesët më të mëdha u zbulua në rrugën e shtëpisë së familjes Ëilcock dhe disa pjesë më të vogla u gjetën në kopshtet aty pranë.
Është meteoriti i parë i kondritit me karbon - klasa më e vjetër e meteoritëve, të cilët përmbajnë materiale të pranishme gjatë formimit të sistemit diellor - që është gjetur në Britaninë e Madhe.
Most importantly, it was collected within hours before the rain fell, and analyzed almost immediately, making it a rare uncontaminated specimen.
The analysis, published in the journal Science Advances, concludes that the meteor originated from an asteroid body somewhere near Jupiter.
The research also found that the ratio of hydrogen isotopes in the water closely resembled the composition of water on Earth.
Extracts from the Winchcombe meteorite also contain extraterrestrial amino acids - prebiotic molecules that are fundamental building blocks for the origin of life.
Because the composition of the Winchcombe meteorite has been preserved so pure, the analysis suggests that similar asteroids played an important role in providing the ingredients needed to start oceans and life on early Earth.
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