Hidden in the HeavensAre we alone in the universe? It's a fundamental question for Earth dwelling humankind. Are there other worlds like ours, out there somewhere? In Hidden in the Heavens, Jason Steffen, a former scientist on NASA's Kepler mission, describes how that mission searched for planets orbiting Sun like stars, especially Earth like planets circulating in Earth like orbits. What the Kepler space telescope found, Steffen reports, contradicted centuries of