21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-01-17 07:04:02

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SEARCH SPEEDS. “The figure of merit one chooses thus depends on the haystack one is searching and how one is searching it; because different searches historically have had very different search methodologies—even among narrowband radio searches at the same wavelengths—it can be difficult to compare their relative search speeds.” https://lnkd.in/dKzsrBv View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-01-17 07:02:14

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TIME FUNCTIONAL. “A given telescope and instrumentation performing a survey of a given type will take some amount of time to complete a survey for a given sort of technosignature down to a given sensitivity. Intuitively, one would like to define a survey speed—i.e., haystack volume surveyed per unit of time—that was more or less constant throughout the survey and described the haystack volume searched to date as a linearly increasing function of integration time or telescope time.” https://lnkd.in/dKzsrBv View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-01-17 07:00:16

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ACUITY. “Artifact SETI seeks astrophysical anomalies and exotica that are consistent with predictions for alien technology, but may not be dispositive of such technology. Here, the metaphor breaks down somewhat, but we might interpret the needles and straw in these haystacks to be hard to distinguish. Finding such maybe-needles nonetheless helps communication SETI efforts to narrow down which parts of their haystack to focus on to find more unambiguous needles.” https://lnkd.in/dKzsrBv View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments
linkedin post 2021-01-18 04:15:31

linkedin post 2021-01-18 04:15:31

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OUTER SPACE is typically thought of as a cold dark empty vacuum with large planets quietly circling around, and this is how many films portray it. But we now know it is a hugely dynamic place, with enormous rivers of charged particles forming complex structures and extreme weather conditions, full of magnetic and gravitational forces that are orders of magnitude greater than we experience, and where quantum particles emerge and vanish in a bubbling cauldron. This magnificent review illustrates it superbly. https://link.springer.com/article/10.12942/lrsp-2007-1 View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-01-17 06:59:29

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NOISE. “There is also the issue of recognizing a needle when one finds it, and not mistaking it for a particularly odd piece of straw. Communication SETI typically seeks signals so obviously artificial that there will be no doubt that the search has succeeded.” https://lnkd.in/dKzsrBv View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-01-17 06:56:56

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BUCKET PROBABILITIES. “Much of the SETI literature is dedicated to guessing or reasoning which haystacks might contain many needles. For instance, if we posit that extraterrestrial species are trying to get our attention and so have created obvious "beacons", then we can focus our efforts on those haystacks or parts of haystacks where needles would most obviously be left for us to find, i.e., we can identify which haystacks represent Schelling points in a game of mutual search—for instance, by guessing at "magic frequencies".” https://lnkd.in/dKzsrBv View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-01-17 07:24:39

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FRACTAL WORLD. “Most cells, tissues, organs – in either the animal or vegetal worlds – are systems in which the component parts and unit fragments assemble with different levels of complexity and recursive organization at several orders of magnitude. This means that a single fragment or element may, on various scales, reproduce the whole object from which it is derived; in other words, it is self-similar, albeit in a statistical sense.” https://www.oatext.com/The-living-realm-depicted-by-the-fractal-geometry.php#gsc.tab=0 View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-01-17 06:55:42

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VARIOUS CRITERIA. “SETI optimists hope that there are many alien needles to be found, presumably reducing the time to find the first one. Note that in this metaphor the needles are the detectable signatures of alien technology, meaning that a single alien species might be represented by many needles.” https://lnkd.in/dKzsrBv View in LinkedIn
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