A single exploding star could build 7,000 Earths

You probably already know that everything is made of stardust: The fusion that churns inside stars turns small elements (like hydrogen) into large ones (like carbon) that go on to build planets. Now, by tracking cosmic dust, scientists have found evidence that it may be the violent star explosions called supernovas that push these life-giving materials into the galaxy's future stars and planets.

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