Nasa astronauts conducted a number of different tests on board the Orion spacecraft after arriving in space, following the launch of the Artemis II mission on Wednesday.
"We forgot how beautiful it is to look down on Earth", said astronaut Reid Wiseman, the mission commander.
On their way to the Moon is also pilot Victor Glover, and mission specialists Christina Koch and Jeremy Hansen.
The crew are "safe, secure and in great spirits", a Nasa official said.
