Often-complex ideas are explained with clarity and precision, but this is clearly a passion project for the author, and the book soars where he deploys more poetic language, as when musing on the deeper themes that arise from his central question. ... If you've ever looked up at the sky and pondered on the big questions of life in the Universe, this is essential reading.
BBC Sky at Night magazine
Absolutely brilliant ... a real gem. It's written in a very engaging way, and offers plenty of scope for the reader to make up their own minds as to the existence (or not) of extra-terrestrial life. It's not often that a non-fiction book has me uttering so many oohs and ahhs, but this one did ... It also left me with an unexpected feeling: hope.
Dawn's Book Reviews