More and more credible witnesses have seen UFOs. One in six stars has an Earth-sized planet. Astrophysicists believe 2013 will likely be the year we discover a planet similar to Earth that may hold the ingredients for extraterrestrial life.This annually updated reference on unidentified flying objects (UFOs), the search for habitable planets, and extraterrestrial life provides authoritative information from numerous sources including experts at the Central Intelligence Agency (CIA), the Federal Bureau of Investigation (FBI), the U.S. Air Force, highly respected experts at the Congressional Research Service as well as credible witnesses who have experienced UFO and extraterrestrial encounters.