Launch day has arrived for NASA's Artemis II mission-here's what to expect

Key Points:

• NASA's Artemis II mission, set to launch as early as Wednesday from Kennedy Space Center, will carry four astronauts on a nine-day journey around the Moon, marking the first crewed flight of the Orion spacecraft after 20 years of development.
• The crew includes mission commander Reid Wiseman, pilot Victor Glover, mission specialist Christina Koch, and Canadian astronaut Jeremy Hansen, who will test the spacecraft's systems and conduct maneuvers critical for future lunar missions.
• Launch preparations involve loading over 750,000 gallons of super-cold liquid hydrogen and oxygen propellants into the Space Launch System rocket, with careful monitoring for hydrogen leaks, a challenge experienced during previous fueling attempts.
• Weather forecasts predict an 80% chance of favorable conditions for launch, with close attention on cloud formation and wind patterns to ensure safety during liftoff and potential abort scenarios.
• After launch, the spacecraft will enter a high-Earth orbit before performing a trans-lunar injection burn to travel beyond the Moon, aiming to set records for distance and speed while testing deep space communications and providing live views for public engagement.