Depuis la découverte du rayonnement fossile, on a pu dater la naissance de notre univers à 13,8 milliards d’années. Depuis cet instant, le big bang, l’univers est en expansion, les galaxies s’éloignent les unes des autres. Cette évolution sera-t-elle infinie ou cessera t-elle un jour pour rétrograder l’univers à un big crunch ?
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