NASA tests rocket engine with 3D-printed 'shock absorber'

The world's biggest rocket that could take humans to Mars in the 2030s is a step closer to reality.NASA has completed a crucial hot fire test of its RS-25 engine flight controller at Stennis Space Center near Bay St. Louis, Mississippi.A 3D printed 'shock absorber,' intended to give astronauts a smoother ride, was tested during the 365-second event.The part will now be installed on an engine for use by NASA's Space Launch System (SLS), a deep-space rocket designed to be the most powerful on t...