SpaceX’s Starship spacecraft exploded on its test stand late Wednesday, sending a large fireball into the South Texas sky and dealing another major setback to Elon Musk’s company. It was the fourth time the company has lost a Starship spacecraft this year. In three previous test flights, the vehicle came apart or detonated during its flight.

SpaceX's massive Starship spacecraft exploded into a dramatic fireball during testing in Texas late on Wednesday, the latest in a series of setbacks for billionaire Elon Musk’s Mars rocket program.