Martin Rees

Perhaps future space probes will be plastered in commercial logos, just as Formula One cars are now. Perhaps Robot Wars in space will be a lucrative spectator sport. If humans venture back to the moon, and even beyond, they may carry commercial insignia rather than national flags.

I am delighted to be joining 'Guardian U.S.'s team as a weekly columnist, and to have the chance to address American and global current events on its distinguished platform. 'Guardian U.S.' brings the 'Guardian's hard-hitting investigative brand to a new focus on American news and opinion.