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Making Sense of Space Dust

By R&D Editors | August 16, 2010

Making Sense of Space Dust 

 Robert Peale in his lab with Tatiana Brustentsova, a post-doctoral research associate
Robert Peale in his lab with Tatiana Brustentsova, a post-doctoral research associate. Courtesy of Jason Greene

The chemical breakdown of minerals that may be lurking in space dust soon will be available to scientists around the world. Because space dust contains the basic ingredients that form planets, the analysis could provide important clues about how the solar system formed and how life emerged. For decades, astrophysicists have been studying these clouds of dust, which contain ices, silicate minerals and iron compounds. But until the University of Central Florida (UCF) physicists started looking at earth’s minerals with far IR spectroscopy, identifying the minerals in space dust was … ambiguous at best.

“It was an educated best guess,” said Robert Peale, a physics professor who has worked on mineral sampling projects at UCF since 1991.  “We’ve analyzed more than 160 minerals found on earth. Now, we can compare our findings with new results coming in from the European Space Agency’s Herschel telescope and start making some headway.”

Scientists have been using Herschel and NASA’s Spitzer telescope to chronicle observations of space dust, and they also evaluate rare samples brought back from space missions or found when meteorites crash on earth. Knowing what kinds of minerals are floating in space and are on asteroids and other planets can give scientists clues to the temperature of those celestial bodies, whether water is present and how the asteroids and planets were formed.

“A complete understanding of the mineralogy of cosmic dust is essential to understanding the formation and mineralogy of planets and, ultimately, to unraveling how life emerged in the universe,” said Tatiana Brustentsova, a post-doctoral research associate working with Peale on the $250,000 project.

NASA funded the research through its Jet Propulsion Lab in California. The agency is collaborating with the European Space Agency’s Herschel mission, which launched in May 2009. The research is being performed in collaboration with scientists George Harlow and Denton Ebel at the American Museum of Natural History in New York City and with Carey Lisse and Karl Hibbetts at Johns Hopkins University Applied Physics Lab.

The far-IR spectra for the minerals UCF’s team studied will be available to scientists around the world via the Internet once the project concludes in summer 2010. Findings will be published in the Monthly Notices of the Royal Astronomical Society journal.

Scientists use IR spectral analysis to look at the chemical properties of matter and gas. Each mineral is ground up to a fine powder, mixed and melted into a transparent plastic pellet, and then it is placed in an instrument that looks at its infrared transmission spectrum. Each mineral absorbs infrared at specific frequencies that correspond to its chemical composition and structure — playing a very specific “tune” that can be observed and recorded by the spectrometer.  Minerals can be identified in space by comparing the “music” emitted by cosmic dust with the “scores” the UCF researchers wrote for the minerals in the lab.

The observations in space don’t always match the chemical signature of minerals on earth, possibly because they undergo unique kinds of weathering, such as cosmic ray bombardment.

The team hopes to get funding for the extension of the project in time to capitalize on the European Space Agency’s planned SPICA (Space Infra-Red Telescope for Cosmology and Astrophysics) space mission set to launch in 2018.

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