Commercial nuclear reactors all work pretty much the same way. Atoms of a radioactive material split, emitting neutrons.

Two billion years before we made history and split the atom, the Earth had already accomplished it and was running its own ...

A small US nuclear startup has quietly crossed a threshold that most young fission companies only talk about, achieving a self-sustaining chain reaction in a test system without ever boiling water or ...

Nuclear weapons haven’t been tested in the United States since 1992. Find out why, and what could happen if the hiatus ends.

It’s rarely appreciated just how much more complicated nuclear fusion is than nuclear fission. Whereas the latter involves a process that happens all around us without any human involvement, and where ...

Editor’s note: “Behind the News” is the product of Sun staff assisted by the Sun’s AI lab, which includes a variety of tools such as Anthropic’s Claude, Perplexity AI, Google Gemini and ChatGPT.

Clarity is key on most issues relating to nuclear weapons, and testing them is no exception. America’s adversaries are carrying out low-level nuclear tests and gaining an advantage over the United ...