CAPE CANAVERAL, Fla. — NASA has begun a two-day practice countdown leading to the crucial fueling test of its new moon rocket. This mission represents a remarkable moment, potentially sending four astronauts on a lunar flyby for the first time since 1972. Commander Reid Wiseman and his crew are currently in quarantine and will monitor the preparations from Houston until they head to Kennedy Space Center, which was previously delayed due to cold weather. If all goes well, the fuel will be loaded into the 322-foot Space Launch System rocket, with a chance to launch within a week. Set to last nearly 10 days, the mission will take the astronauts in the Orion capsule journeying around the moon and back without a stop until they splash down in the Pacific.