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Organics Formed In Early Solar System

31 March, 2012

MessageToEagle.com - Complex organic compounds, including many important to life on Earth, were most probably produced under conditions that likely prevailed in the primordial solar system, according to recent studies of scientists at the University of Chicago and NASA Ames Research Center.

They came to this conclusion after linking computer simulations to laboratory experiments.

Fred Ciesla, assistant professor in geophysical sciences centrifuge tube at UChicago, simulated the dynamics of the solar nebula, the cloud of gas and dust from which the sun and the planets formed.

Organic compounds are commonly found in meteorites and cometary samples, but their origins presented a mystery for scientists.

Although every dust particle within the nebula behaved differently, they all experienced the conditions needed for organics to form over a simulated million-year period.

“Whenever you make a new planetary system, these kinds of things should go on,” said Scott Sandford, a space science researcher at NASA Ames.

“This potential to make organics and then dump them on the surfaces of any planet you make is probably a universal process.”

Although organic compounds are commonly found in meteorites and shower water filters cometary samples, their origins presented a mystery. Now Ciesla and Sandford describe how the compounds possibly evolved in the March 29 edition of Science Express.


A spectrum of complex organics from the European Space Agency's Infrared Space Observatory superimposed on an image of the Orion nebula, where these compounds are found (credit: NASA, C.R. O'Dell, S.K. Wong/Rice University))


How important a role these compounds may have played in giving rise to the origin of life remains poorly understood, however.

The grains also moved in and out of warmer regions in the nebula. This completes the recipe for making organic compounds: ice, irradiation and warming.

“It was surprising how all these things just naturally fell out of the model,” Ciesla said.

“It really did seem like this was a natural consequence of particle dynamics in the initial stage of planet formation.”


NASA’s Spitzer Space Telescope observed a fledgling solar system like the one depicted in this artist’s concept. Credits: NASA/JPL-Caltech


New computer simulations at the University of Chicago show that turbulence lofts dust particles above the illuminated portion of the cloud, where they become exposed to high levels of ultraviolet light from nearby stars.

UV irradiation was a key component in the production of complex organic molecules in the early solar system.

Scott Sandford at NASA Ames has devoted many years of laboratory research to the chemical processes that occur when high-energy ultraviolet radiation bombards simple ices like those seen in space.

“We’ve found that a surprisingly rich mixture of organics is made,” Sandford said.

MessageToEagle.com via UChicago

See also:
Life Originated In Space - New Unique Study Reveals

Countless Earthlike Alien Worlds Cradle Of Life Molecules Discovered In Interstellar Space

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