New Horizons was designed by NASA to study Pluto and the fringes of our solar system, farther away than any spacecraft has ever explored. Join science writer Elaine Scott as she tells the story of this mission. For Stephen Hawking, New Horizons signifies that We explore because we are human and we want to know. This remarkable ship, no bigger than a piano, and using no more energy than a lightbulb, has already traveled three billion...