It may not have been far, far away, but it certainly is from long, long ago.
Scientists have discovered some of the original interstellar dust that formed the Earth and the solar system billions of years ago, a new study said.
The discovery is the “surviving pre-solar interstellar dust that formed the very building blocks of planets and stars,” said study lead author Hope Ishii of the University of Hawaii at Manoa.
Researchers collected the surviving ancient dust from Earth’s upper atmosphere, where it was likely deposited from comets. As comets pass near the sun, they release dust that can reach Earth’s orbit and settle through the atmosphere, where it can be collected and later studied with electron microscopes.
“These interplanetary dust particles survived from the time before formation of the planetary bodies in the solar system, and provide insight into the chemistry of those ancient building blocks,” said study co-author James Ciston of the Lawrence Berkeley National Laboratory in California.
The “dust” is actually tiny glassy grains called GEMS, or glass embedded with metal and sulfides — typically less than 1/100th the thickness of a human hair.
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SOURCE: USA Today, Doyle Rice