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.

NASA conducted a critical test of its Artemis 2 rocket in Florida to determine readiness for a mission carrying four astronauts around the moon.

NASA will soon roll out the Space Launch System (SLS) rocket and the Orion spacecraft to their launch pad at the Kennedy Space Center in Florida.