The second test launch of SpaceX's Starship got off to a successful start Saturday, with the booster separating from the spaceship, but both then exploded shortly after over the ocean. "Such an incredibly successful day," a SpaceX announcer said. "Even though we did have a… rapid unscheduled disassembly of both the Super Heavy Booster and the ship." The largest rocket ever built -- Elon Musk hopes it will one day be used to colonize Mars -- blasted off from the company's Starbase in Boca Chica, Texas shortly after 7:00 am local. Unlike the previous such attempt in April, the booster...