The crew, including Reid Wiseman and Victor Glover, are now prepping for their close flyby of the Moon, getting within about 6437km.
The mission has gone smoothly since launching on April 1, with astronauts practicing manual controls and brushing up on lunar geography.
This is NASA's first trip to the Moon with people since 1972, aiming to set up future lunar landings and maybe even a permanent Moon base by 2032.