7. The Birth of the Sun
TIMELINE · 4.6 billion years ago
Our Sun is a latecomer: when it condensed from a collapsing gas cloud 4.6 billion years ago, the universe had already lived two thirds of its current age. That tardiness was our luck; earlier generations of stars had to die first to supply the iron, carbon and oxygen that built Earth and everything on it. The leftover disk around the newborn Sun became the planets, including the one you are sitting on.
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