Elon Musk’s SpaceX Starship rocket launch was put on hold to troubleshoot ground systems issues ahead of its critical 10th test flight, as the company tries to move forward toward its goal of sending humans to Mars.

The rocket was filled with millions of pounds of propellant and set to launch when SpaceX, around 8:00 p.m. ET, opted to call off the day's launch and turn the operation into a launch rehearsal, considering the weather forecast would remain unfavorable throughout the launch window.