马斯克：SpaceX已将重心转移至在月球建造城市 10年内有望实现

Group 1 - SpaceX has shifted its focus to building a self-sustaining city on the Moon, aiming to achieve this goal within 10 years, while Mars colonization is projected to take over 20 years [1] - The launch frequency for lunar missions can be reduced to every 10 days with a travel time of 2 days, compared to Mars missions which are limited to every 26 months with a 6-month travel time [1] - Despite the focus on lunar development, SpaceX plans to initiate work on Mars city within 5 to 7 years [2] Group 2 - NASA's Artemis 2 crewed lunar mission has been delayed from February to March due to a liquid hydrogen leak during a recent rehearsal [3][4] - The rehearsal included critical operations such as fueling the Space Launch System with cryogenic liquid hydrogen and countdown procedures, which faced multiple interruptions due to technical issues [3] - The Artemis program aims to send astronauts to the Moon, with Artemis 2 involving a 10-day lunar orbit mission with four astronauts aboard the Orion spacecraft [4]