Murchison Meteorite: Seven Billion Years Young!

The oldest dust sample, perhaps 7 billion years old, predates the formation of our planet and the sun

Dust-rich outflows of evolved stars similar to the pictured Egg Nebula are plausible sources of the large presolar silicon carbide grains found in meteorites like Murchison. (Image courtesy NASA, W. Sparks (STScI) and R. Sahai (JPL). Inset: SiC grain with ~8 micrometers in its longest dimension. Inset image courtesy of Janaína N. Ávila.)

Meteorite Grains Are the Oldest Known Solid Material on Earth

by Jay Bennett,

A little more than 50 years ago, on September 28, 1969, a meteorite crashed near the rural village of Murchison in Victoria, Australia. Witnesses saw a fireball streak through the sky and break into three pieces just before 11 a.m. local time, followed by an audible tremor in the area. Locals came upon several fragments of the meteorite, the largest of which, with a mass of 680 grams, crashed through a roof and landed in a pile of hay. Altogether, some 100 kilograms of the Murchison meteorite were recovered and sent to scientific institutions around the world.

“The Murchison meteorite is a wonderful resource for the scientific community,” says Philipp Heck, a curator of meteorites at the Field Museum in Chicago, which houses a large portion of the extraterrestrial object. “It contains some of the oldest condensates in the solar system and also presolar materials.”

Some of those presolar materials—microscopic grains that formed before the sun, measuring about 2 to 30 micrometers across—have been dated at 4.6 to 4.9 billion years old. And one of the grains analyzed in a study published today in the Proceedings of the National Academy of Sciences is estimated to be roughly 7 billion years old, making it the oldest known material on Earth.

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Carol graduated from Riverside White Cross School of Nursing in Columbus, Ohio and received her diploma as a registered nurse. She attended Bowling Green State University where she received a Bachelor of Arts Degree in History and Literature. She attended the University of Toledo, College of Nursing, and received a Master's of Nursing Science Degree as an Educator. She has traveled extensively, is a photographer, and writes on medical issues. Carol has three children RJ, Katherine, and Stephen - one daughter-in-law; Katie - two granddaughters; Isabella Marianna and Zoe Olivia - and one grandson, Alexander Paul. She also shares her life with her husband Gordon Duff, many cats, and two rescues.