The Search for Extra-Terrestrial Intelligence, or SETI, has attracted both praise and sharp criticism from the mainstream scientific community over the years. Extraterrestrials: A Philosophical Perspective explores the important philosophical issues that are at play in this discussion. André Kukla closely examines several of the prominent ideas surrounding the possibility of extraterrestrial life such as the vastness of the universe argument, the argument from mediocrity and the one world, one science argument while offering innovative theories of his own. Among other things, Kukla show uses Chomsky's account of language acquisition to explain why humans will never be able to communicate with extraterrestrials. Extraterrestrials offers a close and thorough treatment of extraterrestrial life that will intrigue a wide audience, especially those who are interested in the philosophy of science.