Last-minute problems forced a launch delay Monday for SpaceX’s mega rocket Starship, attempting a comeback following an explosion on the last test flight. The countdown got down to the 40-second mark,

SpaceX on Monday called off its eighth Starship test flight from Texas over an unspecified issue on the rocket system's core, delaying for at least 24 hours the company's attempt to deploy mock Starlink satellites in space for the first time.

SpaceX officials said they conducted an "extended duration static fire" with the Starship they intend to use for its eighth test flight. They said they used multiple engine thrust levels and hardware configurations to recreate the vibration levels from the failed flight.