Elon Musk’s SpaceX is reportedly chomping at the bit to build Trump’s $175 billion “Golden Dome” defense system, designed to protect the U.S. from foreign missiles “even if they are launched from the other side of the world.”

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.