President Trump wants to build a "Golden Dome" to protect the US from the threat of nuclear weapons. It’s a sign we’re in a new nuclear era.

This episode was produced by Denise Guerra and Devan Schwartz, edited by Jollie Myers, fact-checked by Miles Bryan, engineered by Andrea Kristinsdottir and Patrick Boyd, and hosted by Sean Rameswaram.

Further reading: The return of the nucleat threat. Listen to Today, Explained ad-free by becoming a Vox Member: vox.com/members. Transcript at vox.com/today-explained-podcast.

President Trump announcing plans for the national defense system, the "Golden Dome," in the Oval Office. Photo by Chip Somodevilla/Getty Images.

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