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Learn about The Big Bang — Simply Explained
The Big Bang theory describes how the universe began about 13.8 billion years ago from an incredibly hot, dense point and has been expanding ever since. In the first fractions of a second, fundamental forces and particles formed; within minutes, the first atoms appeared; over billions of years, stars, galaxies, and planets took shape.
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What came before the Big Bang?+
This is one of the biggest open questions in physics. Time itself may have begun with the Big Bang, making ‘before’ a meaningless concept — like asking what’s north of the North Pole.
Is the universe still expanding?+
Yes, and the expansion is accelerating. Distant galaxies are moving away from us faster and faster, driven by a mysterious force called dark energy.
How do we know the Big Bang happened?+
Key evidence includes the cosmic microwave background radiation (the afterglow), the observed expansion of the universe, and the abundance of light elements like hydrogen and helium matching predictions.
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