Once Elon Musk decided to build a reusable spacecraft to carry his dreams of Martian colonization, the engineers at SpaceX knew they would need a special engine for the world’s most powerful rocket.

Space Exploration Technologies (SpaceX) performed an engine test of its first Falcon 9 launch vehicle on its pad at Cape Canaveral Air Force Station, Fla., March 13, successfully igniting all nine ...

Elon Musk is the face of SpaceX — but rockets don’t fly on vision alone. Behind the scenes was Tom Mueller, the engineer who designed the engines that actually made SpaceX work. Before SpaceX, he was ...