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    The articles contained here are reprinted in their entirety by permission of the orginal authors, or the journal in which the paper was published. These articles remain as copyrighted material, and may only be accessed here for personal viewing. If you desire to reproduce these articles, you must seek permission from the original author or periodical.

    Online Articles

    1. Interstellar Communication: Scientific Perspectives

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    2. Bracewell R. N.,
      C. Ponnampernuma and A. G. W. Cameron Ed.
      1974, Houghton Mifflin Co., Boston, pp. 102-117

      Introduction - Much of the stimulating discussion of interstellar communication assumes the use of radio waves for communication. The arguments in favor of the use of radio waves are sound except in a certain case where interstellar probes merit consideration. In this contribution to the discussion of inter-stellar communication, the case for the use of probes will receive emphasis.

      After contact has been made with another civilization, radio is in all cases suitable, and probably optimal, for communication, unless the physics of the future circumvents the serious time delays suffered by electromagnetic waves.

      In the precontact phase it is better to consider the situation as a function of d, the distance to the nearest superior community. If d is small, search by radio will in time succeed. At a certain larger value of d, radio search has serious handicaps, and wider attention should be given to the discussion of probes. If d is larger still, further considerations enter as will be seen below, and finally if the nearest superior community is extragalactic, the situation changes again.

    3. SETA and 1991 VG

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    4. Steel, Duncan
      Anglo-Australian Observatory, and the University of Adelaide

      Abstract - A ~ 10-metre object on a heliocentric orbit, now catalogued as 1991 VG, made a close approach to the Earth in 1991 December, and was discovered a month before perigee with the Spacewatch telescope at Kitt Peak. Its very Earth-like orbit and observations of rapid brightness fluctuations argue for it being an artificial body rather than an asteroid. None of the handful of man-made rocket bodies left in heliocentric orbits during the space age have purely gravitational orbits returning to the Earth at that time, and in any case the a priori probability of discovery for 1991 VG was very small, of order one in 100,000 per anmun. In addition, the small perigee distance observed might be interpreted as an indicator of a controlled rather than a random encounter with the Earth, and thus it might be argued that 1991 VG is a candidate as an alien probe observed in the vicinity of our planet.

    5. Declaration of Principles Concerning Activities Following The Detection of ExtraTerrestrial Intelligence

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    6. Acta Astronautica Vol. 21. No. 2. pp. 153-154, 1990
      0094-5765/90 $3.00+0.00
      Pergamon Press plc
      Printed in Great Britain

      Introduction -- We, the institutions and individuals participating in the search for extraterrestrial intelligence, Recognizing that the search for extraterrestrial intelligence is an integral part of space exploration and is being undertaken for peaceful purposes and for the common interest of all mankind, Inspired by the profound significance for mankind of detecting evidence of extraterrestrial intelligence, even though the probability of detection may be low.

      Recalling the Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, Including the Moon and Other Celestial Bodies, which commits States Parties to that Treaty "to inform the Secretary General of the United Nations as well as the public and the international scientific community, to the greatest extent feasible and practicable, of the nature, conduct, locations and results" of their space exploration........

    7. An International Agreement Concerning The Detection Of ExtraTerrestrial Intelligence

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      (Received 29 November 1991)

      Michaud, Michael A. G.
      American Embassy (SCI), 2 avenue Gabriel, 75382 Paris Cedex 08, France

      Acta Astronautica Vol. 26. No.3 /4, pp. 291-294. 1992
      0094-5765/92 $5.00 + 0.00
      Printed in Great Britain.
      1992 Pergamon Press Ltd

      Abstract -This paper explains the genesis and provides the texts of two proposed agreements on the procedure to be followed (1) after the assumed receipt of a message from extraterrestrial intelligence, and (2) before an answering message is sent from Earth.

    9. A Reply From Earth?

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    10. Michaud, Michael A. G.
      American Embassy (SCI), 2 avenue Gabriel, 75382, Paris Cedex 08, France

      Billingham, John
      NASA Ames Research Center, Moffett Field, CA 94035, U.S.A.
      Tarter, Jill
      SETI Institute. Mountain View, CA 94043, U.S.A.
      (Received 29 November 1991)

      Acta Astronautica Vol. 26. No. 14, pp. 295-297, 1992
      0094-5765/92 $5.00 + 0.00
      Printed in Great Britain
      1992 Pergamon Press Ltd

      Abstract -An approach is proposed to developing a message from Humankind to extraterrestrial intelligence if we detect it.

    11. The Search For ExtraTerrestrial Artifacts (SETA)

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    12. Frietas, Robert A.
      Xenology Research Institute,
      8256 Scottsdale Drive, Sacramento, California 95828, USA.

      The Journal of the British Interplanetary Society, Vol. 36, pp. 501-506, 1983
      Permission for reproducing was granted by the original author.

      Introduction --The Artifact Hypothesis states that an advanced extraterrestrial intelligence has undertaken a long-term programme of galactic exploration via the transmission of material artifacts. An attempt to verify this hypothesis experimentally, the search for extraterrestrial artifacts (SETA), is proposed to detect such evidence in the Solar System by telescopic, radar, infrared, direct probe, or other available means.

    13. Northrop Studying Sonic Boom Remedy *

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