SETI (Search For Extraterrestrial Intelligence): Compendium / Miscellaneous

kamalktk

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The 8-dimensional space that must be searched for alien life

from the MIT technology review. It's less about searching some 8D spacetime than us having searched a minuscule section of the range.

https://www.technologyreview.com/20...l-space-that-must-be-searched-for-alien-life/

"This parameter space is vast. The relevant dimensions include the three dimensions of space, the frequency range of potential signals, their repetition rate, polarization, and modulation, the transmission bandwidth, and the sensitivity of searches to this transmitted power. "
 

uair01

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They document at least 100 stars that have vanished from the sky after having been observed (and some of these disappearances might provide evidence for the activity of exocivilizations)—(PDF, #reminder): https://t.co/kZNsy4BlJx
 

Mythopoeika

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ramonmercado

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Across 10 Million Stars, Not a Single Whisper of Alien Technology

Source: sciencealert.com
Date: 8 September, 2020

In a comprehensive search of a patch of the Southern sky, not even a hint of alien technology has been detected at low radio frequencies.

Across at least 10 million stars that populate the Vela region - the deepest and widest survey for extraterrestrial intelligence yet - the Murchison Widefield Array (MWA) in Australia found none of the technosignatures that might be expected within its range.

However, astronomers Chenoa Tremblay and Steven Tingay from the Curtin University node of the International Centre for Radio Astronomy Research (ICRAR) say their results aren't disappointing at all.

Instead, the research shows how easy it is to conduct the search for extraterrestrial intelligence (SETI) almost incidentally, while obtaining other astrophysical observations.

SETI is really quite tricky. We don't really know what kind of technology an alien civilisation could develop, so we base it on what we know - our own technology, and theories. In the case of the MWA, that means radio signals in frequencies similar to FM radio.

Here on Earth, very low frequency radio can "leak" out through the ionosphere - it's been picked up by our own space probes, as heard in the above audio, recorded by a NASA Polar spacecraft in 1996. More recently, these VLF emissions have been found to be creating a giant bubble around our planet.

If aliens are also producing such signals, and if those signals are powerful enough, researchers believe that we might be able to detect them. However, if we could, it's not with the MWA, and not in the vicinity of the Vela constellation.

"The MWA is a unique telescope, with an extraordinarily wide field-of-view that allows us to observe millions of stars simultaneously," Tremblay said.

"We observed the sky around the constellation of Vela for 17 hours, looking more than 100 times broader and deeper than ever before. With this dataset, we found no technosignatures - no sign of intelligent life."

[...]

https://www.sciencealert.com/across...whisper-of-alien-technology-has-been-detected
 

Xanatic*

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Sadly the Arecibo telescope suffered extensive damage recently, when a cable fell on the dish.
 

Xanatic*

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After even more damage to the Arecibo dish, it will now be demolished. Sad.
 

Kondoru

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If they take it down in a controlled way, then no further damage will be done, they can put it up again.

If they can be bothered...
 

Xanatic*

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Since they are so flush with money you mean?
 

EnolaGaia

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If they take it down in a controlled way, then no further damage will be done, they can put it up again. ...
That's the problem ... After the latest cable failures, testing indicates the entire structure is in danger of collapse. There are now concerns that the entire site is so fragile / unsafe that any controlled dismantlement is a dangerous proposition.
 
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