A byproduct of aging nuclear weapons stockpiles could help power spacecraft on missions lasting decades. Americium-241, an isotope that can be separated from aged plutonium, is being studied as a ...

Space explorations cannot rely on solar power alone. Especially when it comes to the far reaches of our solar system, the Sun's rays become so diminished that solar panels are highly impractical. The ...

Something went boom in outer space and sent radioactive stardust our way, and it's just been found at the bottom of the ocean. Freshly Made Plutonium From Outer Space Found On Ocean Floor Traces of ...