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Organic molecules delivered from extraterrestrial materials may have played a key role in supplying building blocks for life on Earth. Scientists have found all five canonical nucleobases—purines (adenine and guanine) and pyrimidines (cytosine, thymine and uracil)—in samples returned from the C-type asteroid (162173) Ryugu by JAXA’s Hayabusa2 mission. This likely means that organic molecule building … Read more