| http://www.w3.org/ns/prov#value | - 1 May 2003, pp. 57???59. 6. ???According to standard models [all based on the big bang theory], the first stars needed at least 500 million years to begin lighting up and another 700 million to 1 billion years to manufacture heavy elements such as iron and spread them through space. [Wolfram] Freudling therefore expected that gas around the quasars, which were shining when the universe was just 90
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