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#1 2020-09-27 09:53:35

RGClark
Member
From: Philadelphia, PA
Registered: 2006-07-05
Posts: 534
Website

How large a space telescope do we need to see exo-civilizations?

 A team of scientists is investigating ways of detecting exo-civilizations aside from just radio signals as with SETI:

JUNE 19, 2020
Does intelligent life exist on other planets? Technosignatures may hold new clues.
by University of Rochester
https://phys.org/news/2020-06-intellige … clues.html

Two methods of detection mentioned in the article are detection from reflected light from solar panels or detection or pollution such as CFCs.

However, even on our planet the number of solar panels would not be such that they would add appreciably to the Earth light. And CFCs presence might be short lived as it has been on our planet, having been banned.

Could we instead detect the light on the night side coming from all the artificial lighting that would be used in a civilization? Some of the photos seen from space of the cities alit at night on Earth have been quite striking:

Aug. 14, 2014
Space Station Sharper Images of Earth at Night Crowdsourced For Science
iss038e038300_1.jpg
https://www.nasa.gov/mission_pages/stat … ght_images

 
How big would a space scope need to be able to see this in the Alpha Centauri system, for example?


  Robert Clark


Nanotechnology now can produce the space elevator and private orbital launchers. It now also makes possible the long desired 'flying cars'. This crowdfunding campaign is to prove it:
Nanotech: from air to space.
https://www.indiegogo.com/projects/nano … 13319568#/

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#2 2021-06-01 07:02:56

Mars_B4_Moon
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Registered: 2006-03-23
Posts: 885

Re: How large a space telescope do we need to see exo-civilizations?

Mysterious radio burst from space is unusually close—and especially baffling
https://www.nationalgeographic.com/scie … adio-burst

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#3 2021-06-01 08:22:02

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 7,326

Re: How large a space telescope do we need to see exo-civilizations?

For Mars_B4_Moon re #2

Thanks for the link to that (to me very) interesting article.

The use of long baseline interferometers to pinpoint the location was particularly interesting.

I would expect that as we (humans) advance, we should be able to establish long baseline equipment at a variety of points in the Solar system.

Coordinating time between widely scattered locations is a challenge, but (I'm assuming) scientists doing this work have addressed the issue, because light time differences even over such a short distance as the diameter of the Earth are a non-trivial problem.

If you (or any member) happen to run across discussion of plans for (or actual projects) to establish Solar system long baseline observatories I'd be glad to see reports here.

(th)

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#4 2021-06-01 18:41:14

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 23,096

Re: How large a space telescope do we need to see exo-civilizations?

The radio burst have been around for a while now but we have not seen data within them or a repeat of the pattern that one would see if its got data riding on the energy that we receive.

The issue is energy itself spreads and become so low by time it reaches earth it does not matter what data it had on it as its to small to detect.

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#5 2021-06-29 13:56:54

Mars_B4_Moon
Member
Registered: 2006-03-23
Posts: 885

Re: How large a space telescope do we need to see exo-civilizations?

CHEOPS unexpectedly detects a unique exoplanet
http://www.eurekalert.org/pub_releases/ … 062821.php

The Hubble Space Telescope's Near-UV and Optical Transmission Spectrum of Earth as an Exoplanet
https://www.osti.gov/biblio/23013321-hu … -exoplanet

Radio again

A Lunar Farside Telescope Could Detect Exoplanets Through Their Magnetospheres
https://www.universetoday.com/151659/a- … tospheres/

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#6 2021-06-29 20:35:41

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 23,096

Re: How large a space telescope do we need to see exo-civilizations?

From what I remember the chemical signatures for life is looking at these exoplanets to see if signs of life is present.

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#7 2021-07-14 06:06:38

Mars_B4_Moon
Member
Registered: 2006-03-23
Posts: 885

Re: How large a space telescope do we need to see exo-civilizations?

More discovery

Four exoplanets discovered oribiting stars 130 light years from Earth .
https://www.abc.net.au/news/2021-07-13/ … /100288402

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