After 8 months in space, 2 astronauts have walked on the surface of Mars. Well, I'd like to be writing that for real, but in fact it's a simulation running in Moscow, but it is true to say that the 2 astronauts and several other colleagues really have spent 8 months cooped up in a series of cramped chambers pretending to fly to Mars. It's all part of the Mars500 project, designed to test long duration missions. Full details and some pictures of the heroic astronauts on the "surface" can be found on the BBC website. Check back here in about the year 2030 and hopefully I can write that headline for real.