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| Inscribed matter as an energy efficient means of communication with an extraterrestrial civilization |
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| Author(s): Rose C, Wright G |
| Source: NATURE Volume: 431 Issue: 7004 Pages: 47-49 Published: SEP 2 2004 |
| Times Cited: 10 References: 15 |
| Abstract: It is well known that electromagnetic radiation - radio waves can in principle be used to communicate over interstellar distances(1,2). By contrast, sending physical artefacts has seemed extravagantly wasteful of energy, and imagining human travel between the stars even more so(3,4). 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. |
| Document Type: Article |
| Language: English |
| Reprint Address: Rose, C (reprint author), Rutgers State Univ, Dept Elect & Comp Engn, WINLAB, Piscataway, NJ 08854 USA |
Addresses:
1. Rutgers State Univ, Dept Elect & Comp Engn, WINLAB, Piscataway, NJ 08854 USA
2. Antiope Associates, Fair Haven, NJ 07704 USA |
| Publisher: NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: 850VC |
| ISSN: 0028-0836 |
| DOI: 10.1038/nature02884 |
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