Elon Musk’s SpaceX wants to mine asteroids, generate energy on the moon and Mars, and “extend the light of consciousness to the stars,” the company told investors this week. Those interplanetary ambitions are all riding on its explosion-prone megarocket. On Thursday, the company had to postpone its 12th test flight of Starship, the largest and most powerful rocket ever built. Musk, SpaceX’s CEO, blamed the delay on a hydraulic pin that failed to retract.