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NASA scientists want to solve a mystery: Why did life "turn left?"
Asteroid Bennu isn't playing nice with a leading scientific hypothesis.
For Danny Glavin, a senior sample scientist, he wanted to solve a relentless mystery in his life's work: Why are all known living things only based on the left-handed forms of amino acids, the molecules that build proteins? Those results, coupled with the knowledge that space rocks have bombarded the planet for eons, have led scientists to believe ancient asteroids, the solar system's time capsules, would also reveal more left-handed amino acids. Scientists think meteorites and planetary body collisions may have delivered origins of life chemistry to early Earth, including left-handed amino acids.Credit: NASA’s Goddard Space Flight Center Conceptual Image Lab illustration
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