The authoritative guide to ensuring science and technology make life on Earth better, not worse.

plutonium pit production

The Energy Department just made one plutonium pit. Making more is uncertain

By Dylan Spaulding | Nuclear Weapons

Artist's concept shows future ICBM blasting into sky

Another reason to cancel the Sentinel missile: the rising cost of its nuclear warhead

By Stephen Young | Analysis, Nuclear Weapons

Watch the 2025 Doomsday Clock announcement on January 28