Artemis II: SLS/Orion crewed lunar flyby readies — critical braking burn poses mission risk
Artemis II will launch four astronauts aboard Orion on SLS for a 10‑day crewed lunar flyby, the first beyond LEO since 1972. At closest approach Orion will reach ~8,280 km/h and requires a ~2,900 km/h braking burn; failure could strand the crew in deep space.