Phys.org and Universe Today report on a new preprint by astrophysicist Brian C. Lacki that explores how to search for technosignatures—detectable signs of advanced off-world civilizations. The discussion links to the Drake equation, which estimates the number of technological civilizations in the Milky Way but includes an uncertain factor related to how long a civilization produces a detectable signal, not necessarily how long it survives. The articles emphasize that the relevant timescale is the duration during which an alien civilization actively creates signatures our instruments could detect. Because the overlap in time between Earth and any contemporaneous technological civilization is expected to be very small, the work argues that searches should also consider the possibility of finding “ruins” or remnants of civilizations that are no longer actively signaling. Lacki’s proposal suggests that the best target for such remains may be within the solar system, specifically in lunar regolith (moon dust), where past materials or megastructure debris could potentially be preserved. Overall, the sources present the idea as a shift from searching only for current, ongoing emissions to looking for lingering physical evidence of prior activity.
Researchers propose searching moon dust for technosignatures of past alien civilizations
Phys.org and Universe Today report on a new preprint by astrophysicist Brian C. Lacki that explores how to search for technosignatures—detectable signs of advanced off-world civilizations. The discuss...
- Both sources discuss technosignatures—detectable signs of advanced extraterrestrial civilizations—and the role of the Drake equation.
- They state that one Drake-equation uncertainty is the “longevity” of detectable signatures, meaning active detectability, not lifespan.
- They argue that the chance of overlapping in time with an active civilization is very small, increasing the importance of searching for remnants of “dead” civilizations.
- Both sources report a preprint by Brian C. Lacki that proposes moon dust as a promising place to search within the solar system.
- The proposal is presented as a method for locating evidence of past activity rather than only current signals.
Our search for technosignatures—clear signs of advanced civilizations beyond Earth—takes many forms. Many are driven by the famous Drake equation, which attempts to estimate how many technological civilizations there are in the Milky Way. However, there's a big fat question mark at the end of that equation in the form of a variable intended to account for the "longevity" of a civilization. And to be clear, that doesn't mean how long the civilization itself survives. It simply means how long it actively creates a signature that is detectable by our current technology.
3 hours agoOur search for technosignatures - clear signs of advanced civilizations beyond Earth - takes many forms. Many are driven by the famous Drake equation, which attempts to estimate how many technological civilizations there are in the Milky Way. However, there’s a big fat question mark at the end of that equation in the form of a variable intended to account for the “longevity” of a civilization. And to be clear, that doesn’t mean how long the civilization itself survives. It simply means how long it actively creates a signature that is detectable by our current technology. A new paper, available in pre-print on arXiv from Oxford astrophysicist Brian C. Lacki, argues that, since the chances of us overlapping in time with any such civilization are miniscule, we’re much more likely to find the ruins of a “dead” civilization - and, surprisingly, the best place to do so might be in our own solar system.
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