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Adenine, which helps make up the rungs of DNA's spiraling, ladder-like structure, turned up in eleven of the meteorites. Guanine, another key building block of DNA, was present in eight. Two of the twelve meteorites also contained something extraordinary—exotic molecules that are so rare on Earth that they prove the DNA building blocks must have formed in outer space. The discovery lends support to the theory that a kit of pre-made parts from meteorites or a comet might have kick-started life on Earth. Learn more about the breakthrough in the video below. || ", "release_date": "2011-09-15T00:00:00-04:00", "update_date": "2023-05-03T13:53:37.665322-04:00", "main_image": { "id": 483282, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a010800/a010822/Cover_1024x576.jpg", "filename": "Cover_1024x576.jpg", "media_type": "Image", "alt_text": "Meteorites recovered in Antarctica and Australia lead scientists to believe DNA building blocks exist in space.", "width": 1024, "height": 576, "pixels": 589824 } } ], "sources": [], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }