SpaceX's mammoth Starship rocket blasted off Friday on another test flight stretching halfway around the world, this time releasing 20 of the most advanced Starlinks. NASA monitored the space-skimming flight, a critical step toward using the Starship as a lunar lander for moon crews. The previous Starship flight in May also experienced engine trouble, which prevented the booster from making a controlled return. The Starlinks accomplished all their jobs before reentering over the Indian Ocean. The heat shield was also equipped with sensors to measure the extreme pressure placed on the spacecraft during launch.