Urban planning on the moon

摘要

Ot was hard to ignore Mars at last month's International Astronautical Congress (IAC) in Guadalajara, Mexico, even if you managed to avoid Elon Musk's plenary talk. On hallways throughout the convention center, and even on sidewalks outside it, Lockheed Martin had placed signs depicting a Martian landscape. "Mars is closer than you think," they read, a subtle reminder of that company's Mars exploration concepts, the subject of another plenary session at the IAC.