“Critical Dialogues in Cosmology” conference at Princeton, part of the university’s celebration of its 250th anniversary, in the summer of 1996. The purpose of the conference was to bring together the world’s leading cosmologists to address the field’s greatest challenges. One such event, inevitably, involved the value of omega, and it took the form of a debate. On one side was Avishai Dekel, who had recently measured galaxy motions that were consistent with an omega equal to 1. On the other side was Turner, arguing that the amount of matter in the universe was not enough to nudge omega to 1.
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