NASA will fuel up its huge Artemis 2 moon rocket today (Feb. 2), and you can watch the crucial prelaunch test live.
On Saturday night (Jan. 31), the agency officially began Artemis 2's "wet dress rehearsal," a two-day-long exercise that runs through the key procedures and operations that will precede an actual liftoff. Perhaps the most important of these operations is fueling — loading up Artemis 2's Space Launch System (SLS) rocket with more than 700,000 gallons (2.65 million liters) of super-cold liquid oxygen and liquid hydrogen propellant.
