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.
Already in quarantine to avoid germs, Commander Reid Wiseman and his crew will be the first people to launch to the moon since 1972. They will monitor the dress rehearsal from their Houston base before flying to Kennedy Space Center once the rocket is cleared for flight.
