Labels:brass | bulletin board OCR: However some of the neutrons collided with protons and stuck together to form the next simplest element, helium whose nucleus consists of two protons and two neutrons But no heavier elements like carbonor oxygen would have been formed in the early universe Itis difficult 10 imagine that one could build a living system out of just hydrogen and helium, and anyway the early universe was still far too hot for atoms to combine into molecules.
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