But ask when and you’ll be told ‘one day ... on Mars is a rather chilly -63°C, so we’ll need plenty of space on the rockets for big coats. Temperatures at the poles go as low as -123°C so it’s best to ...

But above the red sands on which the rovers trundle, a strange moon rises twice each day. And despite all the scrutiny that Mars itself receives ... for which we have pretty much no idea what ...