President-elect Donald Trump is attending SpaceX’s launch of its Super Heavy Starship, a rocket Elon Musk deemed key for “multi-planetary” space travel, for its sixth test flight from Boca Chica, Texas, at 5 p.m. ET.

On Tuesday’s flight, SpaceX engineers are still seeking to push the rocket out of the lower atmosphere on a suborbital flight to then reenter over the Indian Ocean. Like the previous flight, the goal is for the Super Heavy booster to return back to the launch pad.