CAPE CANAVERAL, Fla. (AP) - SpaceX launched its shiny, bullet-shaped, straight-out-of-science fiction Starship several miles into the air from a remote corner of Texas on Wednesday, but the 6 1/2-minute test flight ended in an explosive fireball at touchdown.It was the highest and most elaborate flight yet for the rocketship that Elon Musk says could carry people to Mars in as little as six years.RELATED: NASA reveals 18 astronauts on Artemis Team, includes first woman, next man on moonThis latest prototype — the first one equipped with a nose cone, body flaps and three engines — was shooting for an altitude of up to eight miles (12.5 kilometers).