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Rosetta's lander lasted just 60 hours on a comet after it bounced into the dark shadows of a cliff, where its solar panels couldn't power the vehicle. Why didn't it carry a more reliable power source, say a nuclear battery like one that's unfailingly fueled Voyager for decades? It's a simple question with a fascinating answer, one that begins with the Cold War and ends with the future space exploration. When it comes to space travel, plutonium-238 is the perfect fuel: long-lasting and, as I'll explain later, relatively safe. Without it, we have no hope of going much further than...

A Los Alamos Story Worthy of Stephen King Ever heard of The Demon Core? It was named by Los Alamos scientists — who are generally not a superstitious lot — after it claimed multiple lives, in a series of strange and horrible accidents. Discover a legend of science... that's worthy of a horror movie. When I was reading Stephen King stories, I was constantly amazed at the things he made scary. It was like reading the legend of the monkey's paw over and over again, with increasingly weird objects. His most famous evil objects are the hotel in The Shining...

KIEV, Ukraine – SNIPPET: "The suspects tried to peddle the substance as plutonium-239, a highly radioactive material that can be used to build nuclear weapons, and demanded $10 million, Ostapenko said. But security experts later determined that the material was likely americium, a widely used radioactive material. Ostapenko said it could be used in a dirty bomb, but not nuclear weapons."

Rockwall man boasts of nuclear reactor, but no arrest made Thursday, January 10, 2008 By JASON TRAHAN / The Dallas Morning News A 22-year-old Rockwall man's Internet boasts that he had made a mini-nuclear reactor in his garage resulted in a visit recently by federal authorities. Representatives with the FBI and the Texas Department of State Health Services' Radiation Control Program took away the man's science equipment on Friday – but not because he was doing anything dangerous or illegal. Rather, the man's parents, with whom he is living, asked that the equipment be removed, officials said. The man, who...