THE SIRENS OF MARS: Searching for Life on Another World

Mars was once similar to Earth, but today there are no rivers, no lakes, no oceans. And yet multiple spacecraft are circling Mars, sweeping over Terra Sabaea, Syrtis Major, the dunes of Elysium, and Mare Sirenum--on the brink, perhaps, of a staggering find, one that would inspire humankind as much as any discovery in the history of modern science.