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Michael Powell

A simulated color image of Cassiopeia A, combining information from three sources: red - information from the Spitzer Space Observatory, orange - from Hubble, and green and blue - from Chandra

Supernovae showered radioactive materials on Earth

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A neutron star collision that creates a supernova. Illustration: shutterstock

Prof. Zvi Piran to the Hidaan website: "The solar system was lucky during its formation to receive an excess of heavy elements from the close merger of neutron stars"

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