In the wake of so many recent film and television hits about aliens - and Roswell having celebrated its 50th anniversary - comes this factual resource to extra-terrestrial intelligence. The book begins with the probability of alien life on other planets and possible signs of primitive life once existing on Europa (Jupiter's moon), and then moves on to the real-life scientists who spend their lives listening for intergalactic radio signals. Chapters delve into UFO sightings throughout history, summarise the legitimacy of claims, and offer various scientic explanations of alien abductions, plus everything everybody needs to know about E.T. searching.