I have a lot of time for Loeb. He has a joy in conjecture and an omnivorous spirit of inquiry that are more reminiscent of 20th-century thinkers such as Freeman Dyson or Carl Sagan than most of his peers. His readiness to stake his reputation on such an unconventional hypothesis is a mark of uncommon bravery . . . [Carl] Sagan would have liked this book

Compelling . . . The book is not so much a claim for one object as an argument for a more open-minded approach to science – a combination of humility and wonder

An astronomical Sherlock Holmes . . . You don’t have to share his conviction to be impressed by the breadth of his argument

In this passionately argued, visionary book, astrophysicist Avi Loeb urges us to abandon the arrogant fantasy that we are the only sentient life form in the universe. The clues are fascinating, and still more are Loeb’s arguments for what they might reveal to us about our own brilliant, blinkered, and quite possibly doomed civilization

A serious scientist makes a serious argument for the hypothesis that our solar system was visited by an object from an extraterrestrial civilization. Is the hypothesis right? Who knows. But let’s try to find out!

It’s good to be sceptical of audacious ideas. But it’s also important to be open to audacious possibilities. Loeb’s sumptuously written book will provoke you to think about the possibility of intelligent life elsewhere in the universe in new and stimulating ways

An exciting and eloquent case that we might have seen a sign of intelligent life near Earth – and that we should search further. World-renowned scientist and innovative thinker, Avi Loeb opens your mind to some of the most important questions facing us as humans: scientific curiosity is key to our future success

A provocative and thrilling account of the search for extraterrestrial intelligence . . . Professor Loeb asks us to think big and to expect the unexpected

One of the more imaginative and articulate scientists around . . . half memoir, half soaring monologue

A persuasive scientific argument about ‘Oumuamua’s otherworldly origins, and delves into why his peers have been so hostile to the idea of life outside of Earth

In publishing his theory, Loeb has certainly risked (and suffered) ridicule . . . Still, it’s thrilling to imagine the possibilities

Have aliens ever been to our solar system? A quick trawl of the internet will reveal any number of people who think that they have, but when the suggestion comes from a distinguished Harvard astrophysicist, maybe it’s time to sit up and take notice

He may or may not be right about ‘Oumuamua. But that hardly seems to make much difference to what is ultimately the main thesis of his book . . . Mr Loeb is surely correct that scientists studying the vastness of the cosmos should entertain risky ideas more often, for the universe is undoubtedly more wild and unexpected than any extremes conjured by the human imagination.

Fascinating and very accessible . . . certainly very well worth a read