The Planet Factory: Exoplanets and the Search for a Second Earth

Twenty years ago, the search for planets--and life--outside the solar system was a job restricted to science fiction writers. It is now one of the most rapidly growing fields in astronomy, with thousands of these "exoplanets" discovered so far. The detection of these worlds has only been possible in the last decade, with the number of discoveries increasing enormously over the last year following the findings of the Kepler Space Telescope.

These new worlds are more alien than anything in fi...