The big boom notwithstanding, it's a major milestone for SpaceX.SpaceX's latest Starship prototype went out in a blaze of glory.The Starship SN10 spacecraft touched down successfully after a high-altitude test flight today (March 3), a major milestone for the company and its crewed Mars ambitions. But the vehicle didn't manage to hold itself together, exploding about eight minutes after landing.The big stainless-steel SN10 (short for "Serial No. 10") launched from SpaceX's South Texas site at 6:15 p.m. EST (2315 GMT), rose 6.2 miles (10 kilometers) into the sky and then came back to Earth for a smooth touchdown 6 minutes...