NASA is taking another crack at fueling its giant moon rocket after leaks halted the initial dress rehearsal and delayed astronauts' first trip to the moon in more than half a century. Launch teams on Thursday began pumping more than 700,000 gallons of fuel into the rocket at Florida's Kennedy Space Center. It's the most critical and challenging part of the two-day practice countdown. The outcome will determine whether March is possible for the Artemis II lunar fly-around with four astronauts. Two weeks ago, dangerous amounts of liquid hydrogen escaped during the operation. NASA replaced two seals and a clogged filter.