NASA’s Orion space capsule is compact, about 12 feet across inside and mostly under five feet tall, making movement awkward in gravity. Mission specialist Christina Koch notes it feels roomier in zero gravity. Koch and other Artemis II crew members are preparing for a moon mission, the first human flight to the moon in over 50 years, using a full-scale mockup at Johnson Space Center. Mission commander Reid Wiseman highlights the extreme speeds involved, from zero to 25,000 miles per hour.