SpaceX launched its mega-rocket Starship but lost both the booster and the spacecraft in a pair of explosions minutes into Saturday’s test flight.

SpaceX's Starship was on the launch pad Thursday, apparently ready to fly in the latest iteration of the spacecraft SpaceX hopes will take people to Mars. The spacecraft, known as SN9, or serial number 9, was filled with propellant, letting off plumes of steam on the launch pad, as fans waited.