Ex-library copy with some damage, especially to bottom of spine/front cover (see close-up). It has stamps, sticker, checkout pocket, etc. Pages are otherwise unmarked. Please see photos. Cambridge University Press 1985 Hardcover ? : ? 288 pages ISBN-10 ? : ? 0521262275 Contributors consider how we might communicate with aliens, and whether we would be able to understand the alien messages we might receive. The authors, who include distinguished scientists, speculate whether the aliens might have a moral code, and what might be our moral obligations in the event any extraterrestrials were ever discovered. Shipping is for the book carefully wrapped, sent Media Mail with tracking. I use recycled materials to save us both money. I am happy to combine shipping. Please message me before payment. Thanks!