(Craig Taylor/iStock/Getty Images Plus) A sprinkling of radioactive plutonium atoms hidden in the ocean floor may trace back ...

Debris is still raining down on Earth more than 100 million years after the giant cosmic explosion that created it. A study published this week in Nature Astronomy by an international team reached ...

When a star dies, it generates an explosion of elemental nuclei and hurls them into space. Those elements, called cosmic rays ...

It is not often that a handful of pale yellow fragments lying quietly in desert sand end up pulling scientists back into ...