Photos: Gantry rolled back to reveal Orion

The budget proposal coming from the White House would also reduce spending on the International Space Station program by more than $500 million.

The Trump administration is requesting $25.2 billion for NASA in fiscal 2021, a 12 percent increase that includes $3.3 billion to kickstart development of a human-rated lander for the Artemis moon program. Nearly half of the budget request, $12.3 billion, is devoted to new and ongoing projects focused on the return to the moon and eventual flights to Mars.

The pace of the European Space Agency’s development of a power and propulsion module for NASA’s Orion crew capsule will likely determine when an unpiloted test flight of the spaceship and its heavy-lift rocket will take off, NASA officials said last week.