NASA’s SpaceX Crew-12 team has entered a carefully controlled two-week quarantine as the countdown begins for their journey to the International Space Station.

NASA began a two-day practice countdown Saturday leading up to the fueling of its new moon rocket, a crucial test that will determine when four astronauts blast off on a lunar flyby.

The Artemis 2 launch is aiming to send four other astronauts around the moon and back to Earth.