December 9, 2014
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Early asteroid impacts may have aided life’s origin
KABOOM Asteroids and comets that smashed into the planet billions of years ago, as in this illustration, could have provided the necessary energy to hot-wire life, new experiments suggest.Asteroids and comets that pummeled the solar system billions of years ago may have jump-started life on Earth with an intense zap of energy.
The jolt given off by such explosive impacts would have been strong enough to spark the formation of genetic molecules, scientists report December 8 in the Proceedings of the National Academy of Sciences. Using a high-power laser, the researchers simulated how the collisions’ energy might smash apart a simple primordial chemical into reactive fragments. The researchers spotted the building blocks of genetic material called nucleobases among the molecular rubble.
“We were looking for the simplest possible scenario in which these nucleobases could have formed,” says planetary scientist David Nesvorný of the Southwest Research Institute in Boulder, Colo. “When things are simple it’s more likely that they occurred somewhere.”
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