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Slow-moving rocks better odds that life crashed to Earth from space

Wednesday, September 26, 2012 8:31
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Researchers based at Princeton University, the University of Arizona and the Centro de Astrobiología in Spain used a low-velocity process called weak transfer to provide the strongest support yet for “lithopanspermia,” the idea that the microorganisms that sprout life came to Earth — or spread from Earth to other developing planets — via collisions with meteorite-like planetary fragments. Under weak transfer, a slow-moving planetary fragment meanders into the outer edge of the gravitational pull, or weak stability boundary, of a planetary system. 


The system has only a loose grip on the fragment, meaning the fragment can escape and be propelled into space, drifting until it is pulled in by another planetary system. Credit: Amaya Moro-Martín …. http://phys.org


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