U.S. President Donald Trump picked a design for his Golden Dome missile defense system and named a leader of the ambitious $175 billion defense program. Here are details on Golden Dome, where the idea comes from and how it will work.

President Donald Trump picked a design for his Golden Dome missile defense system and named a leader of the ambitious $175 billion defense program. The program, first ordered by Trump in January, aims to create a network of satellites, perhaps numbering in the hundreds, to detect, track and potentially intercept incoming missiles.

The Congressional Budget Office has estimated that deploying and operating just the space-based interceptors could cost up to $542 billion over the next two decades.