In 1977, two spacecraft, Voyager 1 and Voyager 2, launched toward the unknown. Nearly fifty years later, they remain alive at the edge of interstellar space, still whispering faint signals back to ...

For decades, deep space exploration has depended on a handful of obscure isotopes quietly heating small nuclear batteries on robotic probes. Now a different, even less familiar element is moving to ...

Americium isotope Am 241 was identified by a group of researchers at the University of Chicago in 1944 and was the fourth trans-uranium element to be discovered, via successive neutron capture ...