NASA’s Artemis II SLS (Space Launch System) rocket with the Orion spacecraft and launch abort system atop stands vertical in the background with a 1.4-million-gallon, 83-foot-wide, liquid hydrogen sphere in the foreground at Launch Complex 39B at NASA’s Kennedy Space Center in Florida on Tuesday, Feb. 10, 2026. Liquid hydrogen is the primary fuel for the core stage and upper stage of the SLS. The Artemis II test flight will take Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialist Christina Koch from NASA, and Mission Specialist Jeremy Hansen from the CSA (Canadian Space Agency), around the Moon and back to Earth.