Life indicators - Chlorophyl

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Profile George 254
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Message 1775118 - Posted: 30 Mar 2016, 22:33:30 UTC

As well as radio signals, another sure indication of a planet where life might be similar to ours is chlorophyll or photosynthesis. Is there any way this could be detected by SETI or similar method?
Apparently water vapour is detectable, so why not chlorophyll?
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Message 1775149 - Posted: 31 Mar 2016, 1:43:20 UTC - in response to Message 1775118.  

Chlorophyll is in the leaves not in the atmosphere !!
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Message 1775226 - Posted: 31 Mar 2016, 7:43:13 UTC - in response to Message 1775149.  

Yes I knew that but the light reflected back from the leaves is detectable, like water vapour in the atmosphere. BTW I am not the first to suggest trying to detect Chlorophyll in a plnetary atmosphere.
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Message 1775238 - Posted: 31 Mar 2016, 9:40:53 UTC - in response to Message 1775118.  

As well as radio signals, another sure indication of a planet where life might be similar to ours is chlorophyll or photosynthesis. Is there any way this could be detected by SETI or similar method?
Apparently water vapour is detectable, so why not chlorophyll?

if you want to detect Life:
1. find planet with water vapor
2. confirm that it has oxygen & carbon-dioxide
you have life there!

OK, what do you do next?
Confirm advanced life...my best guess is pollutants in atmosphere:
1st I'd suggest CFC...why? we have refrigerator in almost every home now!
2nd NOx gasses...those will show internal combustion engines!
3rd SOx gasses...which will show industry development, but also might be triggered by some vulcanos!
4th NH4 gasses...which will show advancement of agriculture!

Problem:
1. you have to be able to detect 1/1.000.000 particles
2. over a distance of few LY
:/

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Message 1775251 - Posted: 31 Mar 2016, 11:13:23 UTC

CFCs are the only gases on your list that do not occur in geological processes, without the need for life.
Bob Smith
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Message 1775528 - Posted: 1 Apr 2016, 8:29:57 UTC - in response to Message 1775251.  

CFCs are the only gases on your list that do not occur in geological processes, without the need for life.

I know...that's why they are number 1 on the list!

all others have to be checked with a "normal values of inhabited world", against "increased amount of industrial society"...though, some gasses (like SOx) can be from volcano eruption, making a "false positive reading...

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Message 1775651 - Posted: 1 Apr 2016, 21:44:23 UTC - in response to Message 1775118.  

As well as radio signals, another sure indication of a planet where life might be similar to ours is chlorophyll or photosynthesis. Is there any way this could be detected by SETI or similar method?
Apparently water vapour is detectable, so why not chlorophyll?

Maybe because quite different orders of magnitude for number of H2O molecules and Chl ones?...
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Profile George 254
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Message 1775834 - Posted: 2 Apr 2016, 22:57:34 UTC - in response to Message 1775651.  

Thanks for this. Do you know any links where there is more detail on this?
Regards
George
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Message boards : SETI@home Science : Life indicators - Chlorophyl


 
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