Ancient Stardust Found in Murchison Meteorite Dated at Seven Billion Years
In 2020, Philipp Heck’s team dated forty presolar grains from Australia’s Murchison meteorite and found stardust as old as seven billion years, older than the Sun, Earth, and every solid material ever measured on this planet
Image: Maketecheasier
In 2020, a team led by Philipp Heck at the University of Chicago dated presolar grains from the Murchison meteorite, revealing some grains are approximately seven billion years old, predating the Sun and Earth. This discovery highlights the meteorite's significance in studying the early solar system and stellar evolution.
- 01The Murchison meteorite fell on September 28, 1969, in Victoria, Australia, and contains over 80 kilograms of material now held in scientific collections.
- 02The 2020 study dated forty presolar grains, revealing exposure ages ranging from 3.9 million to about three billion years before the solar system formed.
- 03Some presolar grains are linked to asymptotic giant branch stars, while others are associated with supernovae, providing insights into their origins.
- 04The age distribution of the grains suggests a star-formation boom around seven billion years ago, indicating enhanced stellar activity prior to the solar system's formation.
- 05The Murchison meteorite serves as a crucial link to understanding the history of stardust and the elements that compose our planet and bodies.
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The Murchison meteorite, which fell in Victoria, Australia, in 1969, has become a key subject of study for understanding the origins of stardust. In 2020, a research team led by Philipp Heck at the University of Chicago dated forty presolar silicon carbide grains from this meteorite, revealing that some grains are approximately seven billion years old, predating the formation of the Sun and Earth. The study, published in the *Proceedings of the National Academy of Sciences*, found exposure ages ranging from 3.9 million years to three billion years before the solar system's formation. The grains' isotopic signatures indicate their formation in the winds of dying stars or from supernovae, providing insights into their cosmic origins. The age distribution of these grains suggests a significant period of star formation around seven billion years ago, highlighting the meteorite's importance in studying the early solar system and the elemental history of our planet. The Murchison meteorite thus represents not only a physical remnant of the early solar system but also a vital archive of the universe's stellar history.
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The findings from the Murchison meteorite provide critical insights into the early solar system and stellar evolution, influencing scientific research and education.
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