SpaceX is launching its 13th flight test of the Starship rocket and its Super Heavy booster on Thursday evening, marking the next step for Elon Musk’s efforts to take astronauts back to the Moon and land humans on Mars.

The 90-minute launch window for the world’s largest and most powerful rocket will open at 6:45 p.m, when Starship Version 3 is set to take off from ​Starbase, ⁠SpaceX’s company town in south Texas. The towering V3, which is over 400 feet tall, is known as the most advanced iteration of the megarocket. It is expected to be used by NASA to land astronauts on the moon in 2028 for the first time since 1969, as well as for SpaceX’s first Mars missions.