Extraterrestrial

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What to expect

The world's most eminent scientist of space explains why he believes in extraterrestrial life

'VISIONARY' Stephen Greenblatt

Harvard's top astronomer lays out his controversial theory that our solar system was recently visited by advanced alien technology.

In late 2017, scientists at a Hawaiian observatory glimpsed a strange object soaring through our inner solar system. Astrophysicist Avi Loeb conclusively showed it was not an asteroid; it was moving too fast along a strange orbit, and leaving no trail of gas or debris in its wake. There was only one conceivable explanation: the object was a piece of advanced technology created by a distant alien civilization.

In Extraterrestrial, Loeb takes readers inside the thrilling story of the first interstellar visitor to be spotted in our solar system. He outlines his theory and its profound implications: for science, for religion, and for the future of our planet. A mind-bending journey through the furthest reaches of science, space-time, and the human imagination, Extraterrestrial challenges readers to aim for the stars-and to think critically about what's out there, no matter how strange it seems.

(P) 2021 Houghton Mifflin Harcourt

Critics Review

  • 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

    The Times
  • 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

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

    Washington Post
  • 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

    STEPHEN GREENBLATT, Pulitzer prize-winning author of THE SWERVE
  • 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!

    ERIC MASKIN, Nobel laureate in Economics
  • 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

    SEAN CARROLL

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