Nuclear weapon - Wikipedia
Both bomb types release large quantities of energy from relatively small amounts of matter. Nine sovereign states are believed to possess nuclear weapons as of 2026: United States, Russia, the …
Nuclear weapon | History, Facts, Types, Countries, Blast Radius ...
Feb 18, 2026 · 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 runaway fission …
NukeSim - Nuclear Explosion Simulator & Nuclear Education Hub
Interactive nuclear explosion simulator with scientific accuracy. Comprehensive nuclear education covering nuclear weapons, nuclear technology, nuclear policy, and nuclear science. Visualize blast …
How Nuclear Weapons Work | Union of Concerned Scientists
Sep 29, 2016 · At the center of every atom is a nucleus. Breaking that nucleus apart—or combining two nuclei together—can release large amounts of energy. Nuclear weapons use that energy to create …
Atomic Bomb: Nuclear Bomb, Hiroshima & Nagasaki - HISTORY | HISTORY
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 the end of …
Status of World Nuclear Forces - Federation of American Scientists
Mar 26, 2025 · Of the world’s approximate 12,241 nuclear warheads, roughly 9,614 are in military stockpiles for use by missiles, aircraft, ships, and submarines. The remaining warheads have been …
Which countries have nuclear weapons, and how many?
Aug 8, 2025 · One of the first questions we need to answer to better understand the risks of nuclear weapons is: which countries have them, and in what quantity? The chart shows estimates of national …
Nuclear Weapons: Who Has What at a Glance - Arms Control Association
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 United States …
The Nuclear Weapon Archive - A Guide to Nuclear Weapons
Greg and I are actively collaborating to provide the broadest variety of nuclear weapon information, in the most convenient form that we can. The two sites each have a different focus. The Nuclear …
List of states with nuclear weapons - Wikipedia
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 five permanent members …