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,

Starship had been expected to launch again Monday. A previous launch ended in an explosion over the Caribbean, and sent commercial airlines scattering to avoid falling rocket debris.

Its last launch on Jan. 16 failed right after liftoff when the upper stage of SpaceX's uncrewed Starship rocket exploded minutes after liftoff, leading the aerospace company to declare the vessel a "loss." It was the seventh test flight of the heavy-lift spacecraft.