Interstellar stuff that breathed life into Earth has younger cosmic roots than predictedJune 16th, 2009 - 12:05 pm ICT by ANI
Washington, June 16 (ANI): An international team of scientists has analyzed 22 interstellar meteorite grains to suggest the stuff that became incorporated into the planets and life on Earth has younger cosmic roots than theories predict.
The analysis was done by University of Chicago postdoctoral scholar Philipp Heck and his international team of colleagues.
Heck and his colleagues examined 22 interstellar grains from the Murchison meteorite for their analysis.
Dying Sun-like stars flung the Murchison grains into space more than 4.5 billion years ago, before the birth of the solar system.
Scientists know the grains formed outside the solar system because of their exotic composition.
“The concentration of neon, produced during cosmic-ray irradiation, allows us to determine the time a grain has spent in interstellar space,” Heck said.
His team determined that 17 of the grains spent somewhere between three million and 200 million years in interstellar space, far less than the theoretical estimates of approximately 500 million years.
Only three grains met interstellar duration expectations.
“The knowledge of this lifetime is essential for an improved understanding of interstellar processes, and to better contain the timing of formation processes of the solar system,” Heck said.
According to the research team, a period of intense star formation that preceded the Sun’s birth may have produced large quantities of dust, thus accounting for the timing discrepancy. (ANI)
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Tags: birth of the solar system, cosmic ray, cosmic roots, discrepancy, dying sun, formation processes, heck, intense star, interstellar grains, interstellar space, irradiation, life on earth, million years, murchison meteorite, philipp, postdoctoral scholar, star formation, theoretical estimates, three grains, university of chicago