lpetrich
Contributor
Ancient stardust in meteorite is older than Earth | Space | EarthSky
Stardust found inside Murchison meteorite in Victoria is oldest-known solid material on Earth - Science News - ABC News
noting
Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide | PNAS
The
Murchison meteorite fell in 1969 near Murchison, Victoria, Australia. Its fall had witnesses, it weighs about 100 kg (220 lb), and it is a carbonaceous chondrite, a meteorite with some organic material in it. It has been heavily studied.
The latest results on it are from dating some microscopic silicon-carbide grains in it by estimating how long they have been exposed to cosmic rays. This indicates that some of the grains are over 2 billion years older than the Solar System.
I recall from somewhere that some meteorites' isotope fractions jump around for some of their elements, and I remember thinking that that is a likely relic of some meteorite dust grains being older than the Solar System. This most recent research seems to confirm that intuition.
Stardust found inside Murchison meteorite in Victoria is oldest-known solid material on Earth - Science News - ABC News
noting
Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide | PNAS
The
Murchison meteorite fell in 1969 near Murchison, Victoria, Australia. Its fall had witnesses, it weighs about 100 kg (220 lb), and it is a carbonaceous chondrite, a meteorite with some organic material in it. It has been heavily studied.The latest results on it are from dating some microscopic silicon-carbide grains in it by estimating how long they have been exposed to cosmic rays. This indicates that some of the grains are over 2 billion years older than the Solar System.
I recall from somewhere that some meteorites' isotope fractions jump around for some of their elements, and I remember thinking that that is a likely relic of some meteorite dust grains being older than the Solar System. This most recent research seems to confirm that intuition.