r n bracewell (13 resultados)

Condición: Good. Pages intact with minimal writing/highlighting. The binding may be loose and creased. Dust jackets/supplements are not included. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.

Condición: Good. Former library copy. Pages intact with minimal writing/highlighting. The binding may be loose and creased. Dust jackets/supplements are not included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.

N.A. Condición: New. ISBN:9789339204846,Territorial restriction maybe printed on the book. This is an Int'l edition, ISBN and cover may differ from US edition, Contents same as US edition.

Condición: New. Brand New! Fast Delivery This is an International Edition and ship within 24-48 hours. Deliver by FedEx and Dhl, & Aramex, UPS, & USPS and we do accept APO and PO BOX Addresses. Order can be delivered worldwide within 6-10 days and we do have flat rate for up to 2LB. Extra shipping charges will be requested if the Book weight is more than 5 LB. This Item May be shipped from India, United states & United Kingdom. Depending on your location and availability.

Condición: New.

Condición: New.

Condición: Fair. This is an ex-library book and may have the usual library/used-book markings inside.This book has hardback covers. In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item,1150grams, ISBN:

Condición: As New. Unread book in perfect condition.

Condición: As New. Unread book in perfect condition.

Hardcover. Condición: Good. Estado de la sobrecubierta: No Dj. Hardcover No DJ. 361 pp. 23 black and white plates at the end of book. Slightly bumped corners. Previous owner's name on front free end-paper. Good. Book.

Softcover. Condición: sehr gut. Originalbroschur. 4°. 11-24 SS. m. 6 Figuren und 1 Tabelle. ausgeschiedenes Bibliotheksexemplar. etwas angerändert, berieben und gebräunt. sehr guter Zustand. Reprinted from The Astronomical Journal", Vol. 79, No. 1. National Radio Astronomy Observatory Green Bank, West Virginia, Serie A, No. 338. in englischer Sprache (in english).

Hardcover. Condición: Very Good. Estado de la sobrecubierta: Very Good. 1st Edition. W.A. Benjamin, Inc., New York. 1963. 320 pages including index. First edition, first printing. Book is tight and clean. Binding and hinges are strong and sound. Pages and endpapers are bright and clean. Green cloth covered panels are bright and clean. Rare original DJ is present. DJ shows minor light soiling and rubbing along folds. One of the earliest collections of serious and intelligent articles on how to communicate with extraterrestrials and advanced societies within our galaxy. A who's who of contributors, collected by former NASA member, and pioneer of nuclear astrophysics, and eminent professor of Astronomy at Harvard, Alastair G.W. Cameron. An excellent copy of the elusive title in its rare DJ. VG+/VG+.

Soft cover. Condición: Very Good. **The Possibility of Extra-Terrestrial Life in the Galaxy** R.N. Bracewell, "Communications from Superior Galactic Communities" in Nature, no.4726, 28May 1960, pp 670-671 in the section of pp 663-742. Extracted from a larger bound volume. VG  Reprinted in A. G. Cameron, ed. (1963). Interstellar Communication. New York: W. A. Benjamin. pp. 243-248. "A Bracewell probe is defined as an autonomous robotic interstellar space probe with advanced AI, pre-loaded with information or data its creators wish to convey. It would seek out existing technological civilizations or monitor worlds where such civilizations are likely to arise, establishing contact, making its presence known, conducting a dialogue over short distances (compared to interstellar distances), and transmitting the results of this interaction back to its origin. In essence, such probes would act as autonomous local representatives of their home civilization and serve as the point of contact between the cultures. In contrast to radio communication across interstellar distances, a Bracewell probe offers key advantages: sustained presence in a target star system, active search capabilities, high-bandwidth local communication, and direct observation. Its physical presence serves as an unambiguous message. However, the probe cannot communicate information beyond its pre-loaded memory or update its contact protocols remotely. This inflexibility risks obsolescence and limits responses to unforeseen situations. Additionally, designing a Bracewell probe requires anticipating diverse alien biologies, psychologies, and technological levels ? an inherently challenging task." "While a Bracewell probe does not need to be a von Neumann probe as well, the two concepts are compatible, and a self-replicating device as proposed by von Neumann would greatly speed up a Bracewell probe's search for alien civilizations." "It is also possible that such a probe (or system of probes if launched as a von Neumann-Bracewell probe) may outlive the civilization which created and launched it. The search for Bracewell probes falls under SETA (Search for Extraterrestrial Artifacts) and SETV (Search for Extraterrestrial Visitation), encompassing efforts to detect evidence of extraterrestrial activity within the Solar System or nearby space. Detection methods might include searching for anomalous objects or emissions, analyzing long-delayed radio echoes (LDEs), and observing gravitational microlensing events. The LDE connection, however, remains highly speculative. These efforts often overlap with broader SETI initiatives, such as Breakthrough Listen. The near-Earth object 1991 VG was initially considered a possible Bracewell probe due to its unusual rotation and orbit. However, subsequent observations identified it as a natural asteroid, with its characteristics attributed to the Yarkovsky effect and other non-gravitational forces."--Wikipedia 714.3 Ptory.