SpaceX was poised to launch another critical test flight of its massive Starship rocket on Sunday, a mission that comes with heightened stakes following a series of explosive setbacks this year.

SpaceX’s Starship rocket system, the most powerful launch vehicle ever constructed, is set to make its 10th integrated test flight as soon as Sunday evening.

SpaceX delayed a critical test flight of its massive Starship rocket roughly half an hour before liftoff on Sunday, saying it needed to fix a liquid oxygen leak and that it would aim for another launch on Monday night.