# \#seti **URL:** https://scanalyst.fourmilab.ch/tag/seti/13.md [Latest](https://scanalyst.fourmilab.ch/latest.md) · [Categories](https://scanalyst.fourmilab.ch/categories.md) · [Tags](https://scanalyst.fourmilab.ch/tags.md) --- ## [Robin Hanson on Grabby Aliens](https://scanalyst.fourmilab.ch/t/robin-hanson-on-grabby-aliens/3530)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 1\ **Last updated:** [29 May 2024 20:10 UTC](https://scanalyst.fourmilab.ch/t/robin-hanson-on-grabby-aliens/3530 "2024-05-29T20:10:17Z")
Perhaps the solution to the Fermi paradox is a question: “Why are humans so early?” The Grabby Aliens hypothesis, presented in the Astrophysical Journal paper, “If Loud Aliens Explain Human Earliness, Quie… --- ## [Jill Tarter on Searching for Alien Technosignatures](https://scanalyst.fourmilab.ch/t/jill-tarter-on-searching-for-alien-technosignatures/513)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 20\ **Last updated:** [15 December 2023 17:37 UTC](https://scanalyst.fourmilab.ch/t/jill-tarter-on-searching-for-alien-technosignatures/513 "2023-12-15T17:37:35Z")
Interestingly, the more than 50 year search for signals from alien civilisations in the radio spectrum would, if conducted by aliens, have failed to detect humans on Earth, as our civilisation does not tran… --- ## [Brad Templeton on Dark Aliens](https://scanalyst.fourmilab.ch/t/brad-templeton-on-dark-aliens/3481)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 27\ **Last updated:** [7 August 2023 08:32 UTC](https://scanalyst.fourmilab.ch/t/brad-templeton-on-dark-aliens/3481 "2023-08-07T08:32:57Z")
For more than fifty years, radio astronomers have scanned the sky in a quest to detect signals from alien technological civilisations, an effort called the Search for Extra-Terrestrial Intelligence (SETI). … --- ## [SETI Searches Looking Toward the Galactic Core](https://scanalyst.fourmilab.ch/t/seti-searches-looking-toward-the-galactic-core/3558)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [5 August 2023 13:20 UTC](https://scanalyst.fourmilab.ch/t/seti-searches-looking-toward-the-galactic-core/3558 "2023-08-05T13:20:29Z")
Searches for Extraterrestrial Intelligence (SETI) have mostly adopted one of two strategies: surveying the whole sky (or large parts of it) looking for sources that stand out from the natural noise of the c… --- ## [Searching for Kardashev Type II and II Civilisations in Background Galaxies](https://scanalyst.fourmilab.ch/t/searching-for-kardashev-type-ii-and-ii-civilisations-in-background-galaxies/3085)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [24 April 2023 12:19 UTC](https://scanalyst.fourmilab.ch/t/searching-for-kardashev-type-ii-and-ii-civilisations-in-background-galaxies/3085 "2023-04-24T12:19:10Z")
In a paper posted on arXiv on 2023-04-05, “Upper limits on transmitter rate of extragalactic civilizations placed by Breakthrough Listen observations”, the authors searched for signals from extraterrestrial… --- ## [Kurzgesagt on Grabby Aliens](https://scanalyst.fourmilab.ch/t/kurzgesagt-on-grabby-aliens/3037)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [13 April 2023 12:24 UTC](https://scanalyst.fourmilab.ch/t/kurzgesagt-on-grabby-aliens/3037 "2023-04-13T12:24:03Z")
The “grabby aliens” hypothesis presented was presented in the 2021 Astrophysical Journal paper “If Loud Aliens Explain Human Earliness, Quiet Aliens Are Also Rare” by Robin Hanson, Daniel Martin, Calvin McC… --- ## [Seth Shostak—How Much of the Galaxy Has SETI Searched for Aliens?](https://scanalyst.fourmilab.ch/t/seth-shostak-how-much-of-the-galaxy-has-seti-searched-for-aliens/2845)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [6 March 2023 13:37 UTC](https://scanalyst.fourmilab.ch/t/seth-shostak-how-much-of-the-galaxy-has-seti-searched-for-aliens/2845 "2023-03-06T13:37:58Z")
Seth Shostak is senior astronomer at the SETI Institute. --- ## [Machine Learning Finds Eight New SETI Candidate Signals](https://scanalyst.fourmilab.ch/t/machine-learning-finds-eight-new-seti-candidate-signals/2744)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [13 February 2023 14:34 UTC](https://scanalyst.fourmilab.ch/t/machine-learning-finds-eight-new-seti-candidate-signals/2744 "2023-02-13T14:34:04Z")
The research paper is “A deep-learning search for technosignatures of 820 nearby stars”. Here is the abstract: The goal of the Search for Extraterrestrial Intelligence (SETI) is to quantify the prevalenc… --- ## [How Searching for Extraterrestrial Messages in the Microwave Band Is Done](https://scanalyst.fourmilab.ch/t/how-searching-for-extraterrestrial-messages-in-the-microwave-band-is-done/2676)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 3\ **Last updated:** [29 January 2023 22:05 UTC](https://scanalyst.fourmilab.ch/t/how-searching-for-extraterrestrial-messages-in-the-microwave-band-is-done/2676 "2023-01-29T22:05:05Z")
While the search for narrowband beacons from extraterrestrial civilisations is now more than six decades old (Project Ozma began in 1960) and ongoing, other approaches are now being explored. It is relativ… --- ## [Does Developing Intelligence Doom a Species to Extinction?](https://scanalyst.fourmilab.ch/t/does-developing-intelligence-doom-a-species-to-extinction/1700)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 15\ **Last updated:** [12 November 2022 21:01 UTC](https://scanalyst.fourmilab.ch/t/does-developing-intelligence-doom-a-species-to-extinction/1700 "2022-11-12T21:01:55Z")
Well, maybe, but not developing intelligence certainly dooms a species to extinction when its environment becomes inhospitable or a calamity such as an asteroid or comet collision occurs. More than 99% of … --- ## [Frank Drake, 1930–2022](https://scanalyst.fourmilab.ch/t/frank-drake-1930-2022/1943)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 4\ **Last updated:** [4 September 2022 13:15 UTC](https://scanalyst.fourmilab.ch/t/frank-drake-1930-2022/1943 "2022-09-04T13:15:00Z")
Frank Drake, pioneer in the Search for Extraterrestrial Intelligence (SETI), leader of Project Ozma, the first search for radio signals from extraterrestrial civilisations, developer of the Drake Equation, … --- ## [Dan Werthimer on SETI, METI, and the Dangers of Broadcasting Our Presence](https://scanalyst.fourmilab.ch/t/dan-werthimer-on-seti-meti-and-the-dangers-of-broadcasting-our-presence/1801)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [6 August 2022 13:02 UTC](https://scanalyst.fourmilab.ch/t/dan-werthimer-on-seti-meti-and-the-dangers-of-broadcasting-our-presence/1801 "2022-08-06T13:02:35Z")
Dan Werthimer has worked on the search for extraterrestrial intelligence (SETI) since 1979, largely in association with the University of California Berkeley SETI project. He is a co-founder of SETI@home an… --- ## [Searching for Technological Civilisations with the Transiting Exoplanet Survey Satellite](https://scanalyst.fourmilab.ch/t/searching-for-technological-civilisations-with-the-transiting-exoplanet-survey-satellite/1481)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [4 June 2022 13:13 UTC](https://scanalyst.fourmilab.ch/t/searching-for-technological-civilisations-with-the-transiting-exoplanet-survey-satellite/1481 "2022-06-04T13:13:07Z")
The Transiting Exoplanet Survey Satellite (TESS) is a NASA science spacecraft whose goal is to perform a near-all-sky survey of bright stars near the Earth with the goal of detecting an estimated 1250 new e… --- ## [Detecting Evidence of Agriculture in Exoplanet Atmospheres](https://scanalyst.fourmilab.ch/t/detecting-evidence-of-agriculture-in-exoplanet-atmospheres/1459)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [1 June 2022 12:59 UTC](https://scanalyst.fourmilab.ch/t/detecting-evidence-of-agriculture-in-exoplanet-atmospheres/1459 "2022-06-01T12:59:10Z")
In the 20th century, industrial nitrogen fixing by the Haber-Bosch process came to dominate the nitrogen cycle of Earth, allowing its human population to grow from 1.6 billion in 1900 to around 8 billion to… --- ## [Could Ultra-High-Energy Cosmic Rays Be Alien Technosignatures?](https://scanalyst.fourmilab.ch/t/could-ultra-high-energy-cosmic-rays-be-alien-technosignatures/1450)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [29 May 2022 13:47 UTC](https://scanalyst.fourmilab.ch/t/could-ultra-high-energy-cosmic-rays-be-alien-technosignatures/1450 "2022-05-29T13:47:46Z")
Here is my January, 1994 article about the Fly’s Eye detection of a particle with an energy of 3.2\\times 10^{20} electron volts, which gave the phenomenon the name now commonly used in popular discussions o… --- ## [Nearby Alien Technosignatures](https://scanalyst.fourmilab.ch/t/nearby-alien-technosignatures/1429)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 1\ **Last updated:** [26 May 2022 15:49 UTC](https://scanalyst.fourmilab.ch/t/nearby-alien-technosignatures/1429 "2022-05-26T15:49:36Z")
Listening for radio signals from alien technological civilisations narrows the search to only those civilisations that happen to be transmitting at the time (accounting for the speed of light) that we are l… --- ## [An Updated Message for Interstellar Communication](https://scanalyst.fourmilab.ch/t/an-updated-message-for-interstellar-communication/1156)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [6 April 2022 12:50 UTC](https://scanalyst.fourmilab.ch/t/an-updated-message-for-interstellar-communication/1156 "2022-04-06T12:50:57Z")
In 1974, the Arecibo radio/radar telescope transmitted a message designed by Frank Drake toward globular star cluster M13. Drake designed a message, transmitted as 1679 bits, which encoded an image of 23 by 73 pixels… --- ## [Ten Reasons to Assume We Are Not Alone in the Universe](https://scanalyst.fourmilab.ch/t/ten-reasons-to-assume-we-are-not-alone-in-the-universe/1130)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 12\ **Last updated:** [5 April 2022 00:07 UTC](https://scanalyst.fourmilab.ch/t/ten-reasons-to-assume-we-are-not-alone-in-the-universe/1130 "2022-04-05T00:07:52Z")
--- ## [Life in the Atmosphere of Venus and Ancient Galactic Civilisations](https://scanalyst.fourmilab.ch/t/life-in-the-atmosphere-of-venus-and-ancient-galactic-civilisations/1062)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [19 March 2022 13:30 UTC](https://scanalyst.fourmilab.ch/t/life-in-the-atmosphere-of-venus-and-ancient-galactic-civilisations/1062 "2022-03-19T13:30:21Z")
--- ## [Dr. Edward Schmidt—“A Search for Analogs of KIC 8462852 (Boyajian's Star)”](https://scanalyst.fourmilab.ch/t/dr-edward-schmidt-a-search-for-analogs-of-kic-8462852-boyajians-star/762)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [21 January 2022 14:58 UTC](https://scanalyst.fourmilab.ch/t/dr-edward-schmidt-a-search-for-analogs-of-kic-8462852-boyajians-star/762 "2022-01-21T14:58:44Z")
The research paper is “A Search for Analogs of KIC 8462852 (Boyajian’s Star)”; here is the abstract. In data from the Kepler mission, the normal F3V star KIC 8462852 (Boyajian’s star) was observed to exhi… --- ## [James Benford: Search for Extraterrestrial Artifacts in the Solar System](https://scanalyst.fourmilab.ch/t/james-benford-search-for-extraterrestrial-artifacts-in-the-solar-system/760)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [21 January 2022 14:03 UTC](https://scanalyst.fourmilab.ch/t/james-benford-search-for-extraterrestrial-artifacts-in-the-solar-system/760 "2022-01-21T14:03:35Z")
Description: I argue that a strategy of exploring for alien artifacts near Earth is a credible alternate approach relative to the existing listening-to-stars SETI strategy. Stars come very close to our sol… --- ## [Identifying the Breakthrough Listen Candidate Signal Source](https://scanalyst.fourmilab.ch/t/identifying-the-breakthrough-listen-candidate-signal-source/286)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [4 November 2021 13:28 UTC](https://scanalyst.fourmilab.ch/t/identifying-the-breakthrough-listen-candidate-signal-source/286 "2021-11-04T13:28:36Z")
On 2021-10-20 I discussed Breakthrough Listen Candidate 1 Signal here, “Breakthrough Listen Candidate Signal Evaluated to be Terrestrial Interference” and the two papers in Nature Astronomy describing the signal and anal… --- ## [You Are Here](https://scanalyst.fourmilab.ch/t/you-are-here/277)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [3 November 2021 15:18 UTC](https://scanalyst.fourmilab.ch/t/you-are-here/277 "2021-11-03T15:18:48Z")
This is why the longevity of radio-loud technological civilisations plays an important role in the Drake equation. The term L is defined as “the length of time for which such civilizations release detectable signals… --- ## [Breakthrough Listen Candidate Signal Evaluated to be Terrestrial Interference](https://scanalyst.fourmilab.ch/t/breakthrough-listen-candidate-signal-evaluated-to-be-terrestrial-interference/239)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [30 October 2021 14:16 UTC](https://scanalyst.fourmilab.ch/t/breakthrough-listen-candidate-signal-evaluated-to-be-terrestrial-interference/239 "2021-10-30T14:16:51Z")
On 2019-04-29, the Parkes radio telescope in Australia was observing the closest star, Proxima Centauri, to study its flare behaviour. The Breakthrough Listen project was conducting a piggy-back analysis of the signals,… --- ## [Ten Unsettling Possibilities Regarding Alien Life](https://scanalyst.fourmilab.ch/t/ten-unsettling-possibilities-regarding-alien-life/63)
**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\ **Replies:** 0\ **Last updated:** [7 October 2021 14:56 UTC](https://scanalyst.fourmilab.ch/t/ten-unsettling-possibilities-regarding-alien-life/63 "2021-10-07T14:56:17Z")
It was interesting to hear the scenario from my science fiction short story “We'll Return, After This Message” figure in one of the segments.