SpaceX launch date of Crew-12 astronauts to the International Space Station will depend on the outcome of the Artemis 2 wet dress rehearsal and launch attempts.

Unseasonably cold weather in Florida has forced NASA to scrub a key rehearsal for the Artemis II mission, delaying preparations for the agency’s most anticipated rocket launch in years.

Four astronauts — pilot Victor Glover, mission specialist Christina Koch and commander Reid Wiseman from NASA, as well as Canadian Space Agency’s Jeremy Hansen — are set to take part in the roughly 10...