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/sci/ - Science & Math

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10927675 No.10927675 [Reply] [Original]

>despite looking (and listening) for signals of other civilisations for decades, we still found nothing
i guess the most obvious reason is that we try to listen to whatever was going on there thousands of years ago? the other way around, if another civilisation is doing the same and is listening in our direction and they are like 20k lightyears away, they only would reicive silence. the only way to detect something would be when the ayyys started to transmit radio long time ago and then it's not impossible, that they are already gone by now. why is this never pointed out by the SETI community?

>> No.10927699

Inverse Square Law makes SETI efforts fairly pointless.

Spectroscopy of exoplanet atmospheres will be more reliable. Since free oxygen does not like to exist and must be produced by life. There are also telltale signs of industry in atmospheres.

>> No.10927713

>>10927699
i guess the only way mainstream radio SETI could find something would be some ancient civilisation that peaked 2mio years ago and we could tune in their MTV and probably learn something from them. to detect anything in real time, it's pointless, i agree.

>> No.10927728

>>10927713
2 mio years ago means it is very far away, there is no way we can detect signals from that far out of background noise, even if directed at our galaxy

>> No.10927734

>>10927728
no, i mean, a planet around a star like 3000 light years away. that would be a realistic chance to catch something. personally, i think, intelligent life is extremely rare in the universe. there are so many factors that enabled humans to rise up to this position most planetary systems we found so far don't have.

>> No.10927762
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10927762

>>10927675
>most obvious reason is
Attenuation.
/thread

>> No.10927764

>>10927713
If they were using a star to power their communication device and happened to aim it right at us, maybe. Do you see any stars out there blinking?

>> No.10928544
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10928544

>>10927675
Our radio equipment is just not good enough. There could be a civilisation on our technology level. Broadcasting radio like we do. On a planet orbiting one of the stars next to us and we would not know.

>> No.10929308

>>10928544
yes, because of the distance, that was my point.

>> No.10929322

>>10927675
except that there is no reason why civilization would just randomly stop broadcasting after a thousand years, if aliens exist, then they are broadcasting for billions of years

>> No.10929330

>>10929322
that's right, but when they are on a similar level as we are, +/- a few hundred years, then we wouldn't hear from them in a long time, depending on the distance. our galactic neighbourhood could be buzzing and we wouldn't know for the next 2k years.

>> No.10929355

>>10927675
The signals we can detect are the kind of signals an entire civilization would have to dedicate most of its ressources towards creating.

>> No.10929358

>>10929355
so no passive signal detection?

>> No.10929717

>>10927764
A less energy intensive and omni directional method of constructing a solar beacon would be to construct large orbital structures around your star that would block part of the stars output.
If you had these with slats cut in them in some numeric sequence it would be very obvious to anyone looking at that star that something fishy was happening with it.
Think of something like Tabby's Star.