Sources say President-elect Donald Trump will be on hand with Elon Musk for the sixth test flight of SpaceX's huge Super Heavy-Starship rocket today.

"Starship's fifth flight test was a seminal moment in iterating toward a fully and rapidly reusable launch system," SpaceX said in a statement. "On the first attempt, the Super Heavy booster successfully returned to the launch site and was caught by the chopstick arms of the launch and catch tower at Starbase."

The Starship rocket will be launched for a sixth time Tuesday and its booster will attempt to re-land on its launch tower near Brownsville, Texas.