Comets likely destroyed life's building blocks rather than delivering them to Earth
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A University of Cambridge study in Scientific Reports used computer simulations to challenge a century-old idea that comets seeded Earth with prebiotic molecules. Comets often carry carbon- and nitrogen-bearing compounds linked to life's origins, but they usually arrive at speeds and angles that destroy those fragile molecules instead of preserving them, so intact delivery would have been extraordinarily rare. Mars may have offered somewhat better conditions, though the odds there remained very low. The results favor asteroids or chemical processes on Earth as more plausible sources.
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