A well-received bestseller published in 1992 bears the title Men Are From Mars, Women Are From Venus. It turns out that men really may be from Mars, but so are women.
The idea is that about 4 billion years ago asteroids hit Mars, which then had a more hospitable climate. Meteorites sent chunks of matter into space, some of which landed on Earth.
Some of the meteorites may have transported key minerals, theorizes Steven Benner, a professor at the Westeheimer Institute of Science and Technology in Gainesville, Fla. Benners theory suggests how ribonucleic acid, a compound with ingredients vital to living organisms, might have come to Earth.
Somehow this stew of interplanetary ingredients evolved into living organisms, and these organisms evolved into humans. Mars was not quite so lucky.
But mankind, now that it has the capacity for interplanetary travel, is driven to go to Mars. Even now, two U.S. rovers are trundling around its surface. High overhead, an American satellite is making a detailed map of Mars surface. Can a GPS for Mars be far behind?
The space program is at a crossroads right now with a choice of missions: Return to the moon? Set up camp on one of the larger asteroids? Capture one of the smaller asteroids for further study?
But the space conversation keeps returning to putting astronauts, perhaps even a colony, on Mars. There are sound scientific reasons, but there is something deeper, less amenable to easy explanation.
Perhaps, at some primal level, we simply want to revisit the old neighborhood.