A SpaceX rocket successfully launched with the company’s Starship spacecraft Thursday, but the two-part system exploded minutes later and crashed into the sea. It was the first test flight for SpaceX’s latest Super Heavy rocket, which carries a large space capsule on top, called Starship. The capsule is designed to one day carry astronauts and supplies to the moon and possibly Mars. No astronauts were on board for the test flight. The liftoff happened Thursday morning at a SpaceX launch center in the southern Texas town of Boca Chica. SpaceX officials have described the two-part rocket ship which stands 120 meters high as the largest and most powerful space vehicle ever built. The vehicle is by far more powerful than any rockets built by the American space agency NASA.