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14-01-2020, 23:17   #16
Fourier
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First related to what was mentioned above, entanglement doesn't allow for instantaneous communication because it doesn't allow for communication at all since there is nothing transmitted, i.e. no energy or anything is sent from one particle to the other.

Secondly you can't really send them human genetic information to build a human because you can't do anything with the genome without the complex biochemical environment of an already living human cell. Easy for us with them already present, but not for the aliens. Like having a programming language source without the compiler if the compiler were a physical machine.
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15-01-2020, 03:16   #17
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There is always the possibility of new yet unknown forms of long distance communication (or signalling) being developed.

Here is a very short but interesting piece on quantum communication I just read. I sure the web is littered with plenty more. Maybe one day quantum communication will be the norm.
All new forms of communication are subject to limitations of spacetime, information being part of the fabric of spacetime...

Also the timing issue referred to still remains

Last edited by M5; 15-01-2020 at 10:48.
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15-01-2020, 19:59   #18
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How coherent are those radio waves at that distance?
Not very. And it's just noise since it all went digital.

High power AM radio is practically gone.

3Ghz radar or 50Hz mains power would be much stronger signals
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16-01-2020, 00:09   #19
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Not very. And it's just noise since it all went digital.

High power AM radio is practically gone.

3Ghz radar or 50Hz mains power would be much stronger signals
Would path loss, Inverse square etc allow for intergalactic transmission realistically? I'm assuming the answer is no, based on little evidence though
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19-01-2020, 18:41   #20
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Interplanetary spaceflight first. Interstellar second.
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20-01-2020, 18:32   #21
Capt'n Midnight
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Interplanetary spaceflight first. Interstellar second.
Unless you have a very compact energy source avoid gravity wells.

Learn to live on asteroids.

Then travel to the stars on them

Travelling slowly means the closest star now may not be the one you reach soonest.



Even at speeds we can achieve ET could have populated the entire galaxy long ago.
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20-01-2020, 18:44   #22
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Would path loss, Inverse square etc allow for intergalactic transmission realistically? I'm assuming the answer is no, based on little evidence though
Nope. We no longer use raw power to burn through the background noise. The days of Marconi using six foot long sparks to get across the Atlantic are gone.

If you want to setup a dedicated radio link in Ireland you have to apply to Comreg.
The power limit will be set to just over what you'd need to have a reliable link in bad weather.

Cellular phones and digital terrestrial TV and satellites all reuse frequencies in the next area over. The days of picking up South Africa on VHF Band I are gone forever

And a lot more data is being carried on fibre.
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