The National Nuclear Security Administration’s deputy administrator for defense programs argued in a memo this month that Los Alamos National Laboratory should increase its annual production of ...

The memo points to geopolitical strife as a reason behind increased urgency to modernize America's nuclear stockpile.

SEATTLE — New batches of plutonium-238 may become available to NASA starting in 2017, perhaps preventing feared shortages of this vital spacecraft power source. The United States has not produced ...

Add Yahoo as a preferred source to see more of our stories on Google. Apr. 22—The head of U.S. Strategic Command in rounds of congressional testimony this week described renewed plutonium pit ...

Deep space exploration, in which spacecraft travel to the outer reaches of our solar system or beyond, requires a whole lot of power. For NASA, a valuable source of this power is a radioactive ...

Over the course of two weeks, a government pledge, that dozens of nuclear weapon cores known as pits could be made by 2030 at new and improved facilities some 1,600 miles apart, publicly crumbled.

Voyages into space are among the most iconic endeavors of the 20th and 21st centuries. Spacecraft that have ventured out to this “final frontier” have relayed stunning images and enlightening ...

This is the second story in a series about Sentinel, the Air Force’s nuclear missile modernization project. Other stories touch on the challenges in the surrounding communities near Sentinel ...