One suspects that within the lifetimes of most everybody under age 45 or so, a human being will orbit and perhaps set foot on Mars. My money is on private voyages for the restless, brave, and hyper-wealthy who might remain on our roasting planet 20 years or so from now and want to visit somewhere that's really cold. But, as measured by the behavior of news people paid to guess the public's interest in things, the very idea of such a trip strikes a deep and broadly shared chord.
The latest example is the broad covereage given to reports from a recent simulated Mars mission. The six 'crew' members, all men, spent 17 months confined in an interlocked barracks in Moscow, built in tubular fashion to evoke the shape that best holds pressurized air. Their two-way communications were subject to long delays, due to the transmission time lapse from real Earth to real Mars. They had to throw their trash out via space-lock type ports. They...