Strategic nuclear weapons are targeted against civilian, industrial, and military infrastructure, while tactical nuclear weapons are intended for battlefield use.

NUKEMAP is a website for visualizing the effects of nuclear detonations.

Sep 23, 2025 · Atomic bombs work with nuclear fission. Two subcritical masses of uranium or plutonium are quickly put together to form a critical mass —that is, enough material to start a …

Understand the physics, effects, and implications of nuclear weapons through scientifically accurate simulations and comprehensive educational resources. Experience the destructive …

Jun 18, 2025 · Nine countries currently either say they have nuclear weapons or are believed to possess them. The first to have nuclear arms were the five original nuclear weapons states — …

Mar 26, 2025 · Combined, the United States and Russia now possess approximately 87 percent of the world’s total inventory of nuclear weapons, and 83 percent of the stockpiled warheads …

Sep 6, 2017 · Scientists first developed nuclear weapons technology during World War II. Atomic bombs have been used only twice in war—both times by the United States against Japan at …

Under the Non-Proliferation Treaty (NPT), the United States, Russia, the United Kingdom, France, and China are recognized "nuclear-weapons states" (NWS). They are also the Permanent …

At the dawn of the nuclear age, the United States hoped to maintain a monopoly on its new weapon, but the secrets and the technology for building the atomic bomb soon spread. The …

As the U.S. and the Soviets slipped into a decadeslong period of animosity that became known as the Cold War, both nations developed an even more powerful nuclear weapon — the …