Last year, scientists announced they'd found a rare type of plutonium at the bottom of the Pacific Ocean. This plutonium is believed to have come from an exploding star. NPR's Nell Greenfieldboyce ...

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Common chemical elements are created in stars like our sun. But heavy elements, like iron, are thought to form in massive stars that explode and spew material — though it might be more complicated.

Traces of rare forms of iron and plutonium have been found at the bottom of the Pacific Ocean, after some kind of cataclysm in outer space created this radioactive stuff and sent it raining down on ...