Extraterrestrials by Wade Roush; The MIT Press Essential Knowledge series; Cambridge, Massachusetts; 224 pages; published April 2020; $15.95.

This is an engaging and an excellent tutorial on life elsewhere – always anchored in that are we alone in the universe, and if we are not, where are they?

Containing 5 chapters, the book is very straightforward in its details: “Alien Dreams”; “Making SETI into Science”; “Extremophiles and Exoplanets”; “Answering Fermi”; and “Joining the Conversation.”

“Why the search connects us to the cosmos,” is the one driver of this volume, explains Roush, a freelance science and technology writer, columnist at Scientific American, and host and producer of the tech-and-culture podcast Soonish.

For starters, as one subtitle explains, we need to organize our ignorance.

So where is everybody? The author dives in on that Fermi Paradox with a first-rate number of scenarios, from the Drake equation to intelligent life is rare to the possibility that technological civilizations are uncommunicative.

If they are “out there” how best to prepare for contact? Roush responds by saying “let’s not spend too much time speculating about an inherently unknowable event.” But he suggests, prior to potential contact, we Earthlings should ask ourselves what we would contribute to an interstellar society and what we should do to prepare for that occasion.

This nicely written, reader-friendly book ends with a glossary of terms and a very useful notes section for the entire volume.

Again, this is an easy-to-read 101-explanation of the mind-bending excursion to contemplate the often asked, are we alone question…or perhaps start grappling with just how crowded is it in the universe.

For more information on this book, go to:


Also, go to “Life as We Don’t Know It – If we’re going to find extraterrestrials, we need to stop assuming they’ll think like humans,” by Wade Roush at:


as well as a podcast featuring Roush at:


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