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    HomeCould key ingredients for life have arrived from space? Scientists say yesConceptual image of meteoroids delivering nucleobases

    Conceptual image of meteoroids delivering nucleobases

    Conceptual image of meteoroids delivering nucleobases - nitrogen-containing compounds crucial in forming DNA's double-helix structure - to ancient Earth. The nucleobases are represented by structural diagrams with hydrogen atoms as white spheres, carbon as black, nitrogen as blue and oxygen as red. NASA Goddard/CI Lab/Dan Gallagher/Handout via REUTERS

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