Extragalactic Internet by black hole gravitational lensing

  • Claudio Maccone
Part of the Springer Praxis Books book series (PRAXIS)


In two recent papers [1, 2] the author proved that radio communications between any pair of stars within our Galaxy are feasible with modest transmitted powers if the gravitational lenses of both stars are exploited. In this chapter we extend those innovative results to the case of radio communications between nearby galaxies. We show that radio communications between galaxies may become feasible if supermassive black holes, usually located at the center of galaxies, are exploited as gravitational lenses. In other words, a massive black hole may be regarded as a huge focusing device for radio waves being transmitted out of that galaxy and/or being received from another galaxy.


Black Hole Spiral Galaxy Massive Black Hole Elliptical Galaxy Solar Mass 
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  1. 1.
    C. Maccone, “Interstellar radio links enhanced by exploiting the Sun as a gravitational lens,” Acta Astronautica, 68 (2011), 76–84.ADSCrossRefGoogle Scholar
  2. 2.
    C. Maccone, “Interstellar radio links enhanced by exploiting the Sun as a gravitational lens,” paper #IAC-09.D4.1.8 presented at the 60th International Astronautical Congress, Daejeon, Republic of Korea, October 12–16, 2009, and distributed to all participants as a CD-ROM file, but not published in printed form.Google Scholar
  3. 3.
    C. Maccone, Deep Space Flight and Communications: Exploiting the Sun as a Gravitational Lens, Springer/Praxis, Heidelberg, Germany/Chichester, U.K. A 400-page treatise about the FOCAL space mission that embodies and updates all previously published material about FOCAL.Google Scholar
  4. 4.
    C. Maccone, “SETI among galaxies by virtue of black holes,” Acta Astronautica, 2012, in press.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.International Academy of Astronautics and Istituto Nazionale di AstrofisicaTorino (Turin)Italy

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