From Mark Kaminsky, Sunnyvale, California, US
When it comes to a perfect site for a moon base, solar radiation can be a danger on the surface. If we could find a cave big enough, that would be a good solution. But lunar dust makes it hard to dig a hole in a conventional way. Some suggest drilling a hole, dropping an explosive in and setting it off at the bottom. Using robots to build a base before we launch people could cut risks further (30 September, p 12).
