From 1942 to 1945, the Manhattan Project had operated in secret to develop a weapon more fearsome than anything the world had ever seen. Now, in mid-July, they were ready — or at least, they hoped so.

The ability to collect this experimental data in very hot, dense, star-like plasma will help researchers validate and improve ...

The photos, he says, are part scientific study and part propaganda, a measure of America’s technological progress and the power of its arsenal. They are also, in a way the Pentagon likely never ...

The 80th anniversary of the atomic bombing of Hiroshima and Nagasaki is this week. It was the only time nuclear warheads were used during war. Here’s a look at the history and current U.S. stockpile.