Watch | NASA tests engine that could take humans to Mars

NASA has performed a test of the engine of next-generation rocket engine that will take astronauts to asteroids, Mars and other deep-space missions. The agency successfully tested an RS-25 engine at Stennis Space Center in Mississippi. Four RS-25s will power the core stage of the Space Launch System (SLS) megarocket that will launch astronauts in the Orion spacecraft on missions to deep space and eventually on the journey to Mars.