Elon Musk, founder of SpaceX, wants to put American astronauts back in space. He wants them to go there aboard American-built rockets powered by American-built rocket engines. And if he succeeds, ...

The SpaceX Grasshopper rocket hovers in midair during a test flight. SpaceX The SpaceX Grasshopper, a new reusable rocket from the private spaceflight contractor, made its highest-ever launch last ...