The Download: moon city problems and drone traffic controllers

This is today’s edition of The Download, our weekday newsletter that provides a daily dose of what’s going on in the world of technology.Mars may be a hellhole, but the moon is not far behindThe US and China are racing to build bases on the moon, with NASA hoping to establish a small lunar city by the end of the century. But the moon is a tremendously hostile place to set up camp.A sprawling lunar base must be safe for its inhabitants, protected from falling asteroids, endless cosmic