How To Make A New Planet Home

Mars Terraforming Mars would involve adding water and an atmosphere, potentially turning the Red Planet into a Blue Marble. Science photo library/Getty Images The recipe for creating a habitable planet turns out to be surprisingly simple: Just add water--and atmospheric gases. Mars has both, relics from four billion years ago when the planet was warm and wet. "When it comes to Mars, and only Mars, the notion of terraforming is no longer in the realm of science fiction," says NASA astrobiologist ...