It's important not only to travel to the moon "with our astronauts, but that we bring with us our values," noted Nasa's acting chief for international and interagency relations, Mike Gold.
Rule No. 1: Everyone must come in peace. Other rules:
— Secrecy is banned, and all launched objects need to be identified and registered.
— All members agree to pitch in with astronaut emergencies.
— Space systems must be universal so everyone's equipment is compatible, and scientific data must be shared.
— Historic sites must be preserved, and any resulting space junk must be properly disposed.
— Rovers and other spacecraft cannot have their missions jeopardised by others getting too close.
Violators could be asked to leave, according to Bridenstine.
The coalition can say, "Look, you're in this programme with the rest of us, but you're not playing by the same rules," Bridenstine said.
The US is the only country to put humans on the moon: Twelve men from 1969 to 1972.
Russia is still on the fence. The country's space agency chief, Dmitry Rogozin, said at an International Astronautical Congress virtual meeting yesterday that the Artemis programme is US-centric and he would prefer a model of cooperation akin to the International Space Station.
China is out altogether. Nasa is prohibited under law, at least for now, from signing any bilateral agreements with China.
- AP