Historical research guide · 1078 · 1967

Intelligence in the Universe

Carl Sagan

In one minute

In June 1967 Carl Sagan filled a single page of Planetary and Space Science with a review of a book called Intelligence in the Universe, written by Roger A. MacGowan and Frederick I. Ordway III and published by Prentice-Hall the year before. Four hundred pages, a twenty-page bibliography, catalogued under the plain subject heading life on other planets: by the mid-1960s the question of who else is out there had acquired a technical literature dense enough that a working planetary scientist reviewed a monograph on it the way he would review one on Martian dust. Sagan was in the middle of that turn himself — his own greatly expanded English edition of Iosif Shklovskii’s book, Intelligent Life in the Universe, had appeared in 1966. This site keeps the page for the thread that runs through it, and the thread is not detection but engineering: what a civilisation does once energy and distance have stopped being constraints. That question is older than the hardware now being built to answer it.

Connection

Chapter 13 is where the separate threads of this site are drawn into one picture, and this is the oldest of them: if the vacuum can be tapped and the metric engineered, then somebody did it first, and the sky is the record of it. Sagan’s generation asked how you would detect such a civilisation; the corpus asks what it would have built, which is the question of THESIS section 5.4.

From the source

The identifier the corpus carries for Intelligence in the Universe resolves to one page of Planetary and Space Science, volume 15, issue 6, page 1095, June 1967 — Carl Sagan’s review of the book of that name by Roger A. MacGowan and Frederick I. Ordway III, Prentice-Hall, 1966, xiii plus 402 pages. It is not the Shklovskii and Sagan book, which is a separate 1966 work published by Holden-Day.Crossref and Semantic Scholar records for DOI 10.1016/0032-0633(67)90177-8; the deposited item title names the reviewed book, publisher, pagination and price
By 1966 the question of intelligence elsewhere in the universe had a technical literature rather than a speculative one. The reviewed book runs to 402 pages and closes with a bibliography of twenty pages, and it was catalogued by libraries under the subject heading life on other planets — a monograph, reviewed in a planetary-science journal by a planetary scientist.Internet Archive catalogue record for the reviewed book, identifier intelligenceinun0000macg: xiii plus 402 pages, bibliography pages 378 to 398, subject life on other planets
Sagan wrote this review at the exact moment he was making the same argument at book length himself: Intelligent Life in the Universe, his greatly expanded English edition of Iosif Shklovskii’s Vselennaia, Zhizn, Razum, was published by Holden-Day in 1966, the year the reviewed book appeared. The review is therefore one of the primary documents of the two-year window in which the search for other technological civilisations became a working programme.Publication records for Shklovskii and Sagan, Intelligent Life in the Universe, Holden-Day, 1966, about 509 pages; and for the June 1967 review
The corpus cites this page for the mature-civilisation thread of THESIS section 5.4 — the claim that a civilisation which has learned to draw energy from the vacuum and to engineer the metric is not a faster version of ours but a qualitatively different one, in which energy stops being a constraint, distance stops being a cost, and matter becomes assemblable.THESIS section 5.4, What a mature civilisation does with it, drawing on Charles Chase on the coherent matter beam, 2026-09-04 at 7:36 to 8:15
What to watch: the 1960s framing measured other civilisations by what they would radiate — radio beacons, waste heat, engineering visible at astronomical distance. The framing this site works from measures them by what they would stop needing: no reaction mass, no fuel, no transit time in the old sense. The observation that would separate the two is a propulsion signature with no exhaust, and that is exactly what the transmedium reports describe.THESIS section 1, links 7 and 8, read against the 1967 review’s subject

The way in

https://doi.org/10.1016/0032-0633(67)90177-8

Historical source-access record. This guide links to the original; it does not reproduce the paper text.

WHAT THIS DOI ACTUALLY IS. The corpus carries this identifier under the bare title Intelligence in the Universe, and the registry record for it also carries the names I.S. Shklovskii and the date c.1966 — which conflates two different works. The DOI resolves to a single page of Planetary and Space Science, volume 15, issue 6, page 1095, June 1967: Carl Sagan’s review of the book Intelligence in the Universe by Roger A. MacGowan and Frederick I. Ordway III, published by Prentice-Hall of Englewood Cliffs, New Jersey, in 1966. Semantic Scholar carries the item’s full deposited title, which names the reviewed book, its publisher, its pagination — xiii plus 402 pages — and its price of 13.50 dollars; Crossref carries Carl Sagan as the sole author, the page as 1095 and the date as June 1967; OpenAlex gives first and last page both as 1095. The separate book Sagan wrote with Iosif Shklovskii, Intelligent Life in the Universe — Sagan’s greatly expanded English edition of Shklovskii’s Vselennaia, Zhizn, Razum, published by Holden-Day in 1966 and running to about 509 pages — is a different work with a different title and is not this DOI. SOURCE NOT REACHED. Elsevier holds the review closed. Unpaywall and OpenAlex both report the record closed with no open location, Crossref registers only Elsevier’s text-and-data-mining licence, ScienceDirect answers HTTP 403 to automated retrieval and the NASA ADS scan page answers HTTP 405, all checked 2026-09-08. Elsevier deposited no abstract, and a one-page review has none. No text of Sagan’s review is reproduced here and none of its wording, judgements or verdict on the reviewed book is characterised on this page, because it was not read. WHAT THE CLAIMS REST ON. The bibliographic records named above, and the Internet Archive catalogue record for the reviewed book, identifier intelligenceinun0000macg, which gives Roger A. MacGowan as author with Frederick I. Ordway III as joint author, Englewood Cliffs, New Jersey, Prentice-Hall, 1966, xiii plus 402 pages, 24 cm, subject heading life on other planets, bibliography pages 378 to 398; the scan itself is lending-restricted and was not read. Each locator below names which of these records it comes from. KIND. The skeleton files this as a book and the field is left as it stands, because the page is about the reviewed book as much as the review; the item itself is a one-page review in a journal.

How to cite it

Carl Sagan (1967) Intelligence in the Universe doi:10.1016/0032-0633(67)90177-8

Where it sits in the curriculum

The unified picture