Imagine an Earth like planet orbiting beyond our solar system in the Milky Way, detected with the help of a powerful space or ground telescope like Keck, Hubble, and Kepler.  A new kids' book about planets, astronomy and space, Planet Hunter tells the story of how astronomer Geoff Marcy and other astronomers use telescopes and innovative techniques to hunt for extraterrestrial planets. Author Vicki Wittenstein.