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  • BBC Science Focus Magazine

    THE EXPLAINER

    Nov 26, 2020 3 minutes
    by MARCUS CHOWN

    WHAT WAS THE BIG BANG?

    WHAT IS THE EVIDENCE FOR A BIG BANG?

    he Universe has not existed forever. It was . Around 13.82 billion years ago, matter, energy, space – and time – erupted into being in a fireball called the Big Bang. It expanded and, from the cooling debris, there congealed galaxies – islands of stars of which our Milky Way is one among about two trillion. This is the Big Bang theory. A universe popping into

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