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Inscribed matter as an energy-efficient means of communication with an extraterrestrial civilization

Abstract

It is well known that electromagnetic radiation—radio waves—can in principle be used to communicate over interstellar distances1,2. By contrast, sending physical artefacts has seemed extravagantly wasteful of energy, and imagining human travel between the stars even more so3,4. The key consideration in earlier work, however, was the perceived need for haste. If extraterrestrial civilizations existed within a few tens of light years, radio could be used for two-way communication on timescales comparable to human lifetimes (or at least the longevities of human institutions). Here we show that if haste is unimportant, sending messages inscribed on some material can be strikingly more energy efficient than communicating by electromagnetic waves. Because messages require protection from cosmic radiation and small messages could be difficult to find among the material clutter near a recipient, ‘inscribed matter’ is most effective for long archival messages (as opposed to potentially short “we exist” announcements). The results suggest that our initial contact with extraterrestrial civilizations may be more likely to occur through physical artefacts—essentially messages in a bottle—than via electromagnetic communication.

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Figure 1: Efficiency of inscribed matter compared to electromagnetic communication.

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References

  1. Cocconi, G. & Morrison, P. Searching for interstellar communications. Nature 184, 844–846 (1959)

    Article  ADS  Google Scholar 

  2. Schwartz, R. N. & Townes, C. H. Interstellar and interplanetary communication by optical masers. Nature 190(4772), 205–208 (1961)

    Article  ADS  Google Scholar 

  3. Purcell, E. W. Radio astronomy and communication through space. In Interstellar Communication Ch. 13 (ed. Cameron, A. G. W.) 121–143 (Benjamin, New York, 1963)

    Google Scholar 

  4. Pierce, J. R. Relativity and space travel. Proc. IRE 47, 1053–1061 (1959)

    Article  Google Scholar 

  5. Cover, T. M. & Thomas, J. A. Elements of Information Theory 247–250, 187–189 (Wiley-Interscience, New York, 1991)

    Book  Google Scholar 

  6. Skolnik, M. Introduction to Radar Systems 6.2–6.5 (McGraw-Hill, New York, 2002)

    Google Scholar 

  7. Townes, C. H. At what wavelengths should we search for signals from extraterrestrial intelligence? Proc. Natl Acad Sci. 80, 1147–1151 (1983)

    Article  ADS  CAS  Google Scholar 

  8. Eigler, D. M. & Schweizer, E. K. Positioning single atoms with a scanning tunnelling microscope. Nature 344, 524–526 (1990)

    Article  ADS  CAS  Google Scholar 

  9. Landauer, R. Minimal energy requirements in communication. Science 272(5270), 1914–1918 (1996)

    Article  ADS  MathSciNet  CAS  Google Scholar 

  10. Mileikowsky, C. F. et al. Natural transfer of viable microbes in space: from Mars to Earth and Earth to Mars. Icarus 145, 391–427 (2000)

    Article  ADS  CAS  Google Scholar 

  11. Bussard, R. W. & DeLauer, R. D. Fundamentals of Nuclear Flight 16–21 (McGraw-Hill, New York, 1965)

    Google Scholar 

  12. Stuhlinger, E. Ion Propulsion for Space Flight (McGraw-Hill, New York, 1964)

    Google Scholar 

  13. Papagiannis, M. Are we alone or could they be in the asteroid belt? Q. J. R. Astron. Soc. 19, 277–281 (1978)

    ADS  Google Scholar 

  14. Crick, F. H. C. & Orgel, L. E. Directed panspermia. Icarus 19, 341–346, (1973)

    Article  ADS  Google Scholar 

  15. Bracewell, R. Communication for superior galactic communities. Nature 187, 670–671 (1960)

    Article  ADS  Google Scholar 

Download references

Acknowledgements

We thank G. Foschini, G. Gonzalez, P. Herry, P. Morrison, P. Shor and S. Tournpis for their comments on an earlier version of the manuscript. This work was supported, in part, by the National Science Foundation.

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Correspondence to Christopher Rose.

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Rose, C., Wright, G. Inscribed matter as an energy-efficient means of communication with an extraterrestrial civilization. Nature 431, 47–49 (2004). https://doi.org/10.1038/nature02884

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