Canadian Astronauts Part of New NASA Moon Mission SHARE ON: Canadian astronauts will be part of the first NASA crewed Moon missions since 1972. Innovation, Science and Industry Minister Navdeep Bains says the Canadian Space Agency and NASA have now signed the Gateway Treaty. NASA says it has committed to two crew opportunities for Canadian astronauts on Artemis missions, “one to the Gateway and one on Artemis II.” Gateway will be an outpost orbiting the Moon that will provide support for what NASA calls, “a sustainable, long-term return of astronauts to the lunar surface” as part of the Artemis program. About one-sixth the size of the International Space Station, Gateway will function as a way station.