Seti - a waste of time?

And they probably already do with sonar.

 

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Alien 'sensors' are already here in the form of insects. These are the equivalent of your nanobot technology. They communicate with home by placing their communications into their trouser pocket which is really a tiny black hole held in place by nano-velcro. They were sent by the gallactic commision and have long watched over the earth and it's life-forms as guardians. They built the first life on earth from molecules found lying around. Everytime you kill or squash an insect another one replaces it. Spiders belong to the narclept, an evil warrior who wishes to destroy the commision by stealth. Spiders are also a form of nanobot but they have developed self-awarness. A while ago they realised that if they destroyed all the insectiod nanobot's their continued presence on earth would be of no use. They decided at a mass meeting to 'regulate' the insect world so they could exist for longer. Since they had overwritten their 'prime directive' narclept decided to send 'fleas' to the earth. The first fleas were parachuted in a long time ago while humans were scratching around. Fleas were supposed to have found their way to the ears of birds were they could infleaance them to eat spiders. Fleas however, being short-sighted just attached themselves to anything. As a direct result of this The commision decided to try and gain the favour of fleas which they did. For some time now there has been a race by the two warring factions to enlist the help of pebbles. these are quiescent observers who store information in a holographic silicon structure. HUman scientists have learned to read some of these stones. Bees and wasps long ago decided to mind their own business until the insect wars had finished allowing them to take over the world for themselves so they could have peace and quiet.

 

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I wouldn't let the fleas 'bug' ya too much.

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Actually, I do have a serious question on the subject, what is the distance in light years where out TV and radio signals attenuate into undetectability.
Keeping in mind that interstellar gas and dust will block/soak-up almost any signal if the distance is far enough.

 

The Voyager's are about 100Au out at the moment, transmitting about 20Watts RMS which is detected from earth using only the most sensitive equipment. If you were to double the distance you would need 4 times the power. Voyager 1 is about 1/3000th the distance of the nearest star (but not in the same direction). A transmission from Centauri would need 180Megawatts of power behind it. Typical UHF TV transmitters (terrestrial) are between 100kW and 1MW. A signal from Sirius would need a power of about 750MW. This figure could reduce by developing more directional antennas, and more sensitive receivers.

 

To Megabrain et al:

How much power is need for red-light laser transmission link?

Assume narrow band detector (hetrodyne) to improve S/N ratio and beam travels backward thru large telescope to reduce angular spread and is collected by large telescope within the center of the spread beam.

I am to lazy to do this and do not know the internal noise limits of a liquid N2 (at least) cooled detector.

 

It's still EM waves, so it will be the same order of magnitude, but you won't do it through a telescope!.

 

I have always been interested in the possibilities of contact with extraterestials, but alas what Seti is trying to achieve is a lost cause, though thats not to say it's wasn't a pioneering one... Suggest for a minute we were really were fortunate to recieve an extraterrestrial communication the speeds of communication could be vast in comparison with the speeds that our radio technology uses. Maybe they are useing frequency bands we don't even know about. Maybe they are using light pulses of forms of light we don't even know yet.. using a completely new technological and alternative mathematic algorithms that our terrestrial computers simply cannot decode, regardless of software being used. That Wow signal might have been a marker of something more significant... but maybe we detected the signal but were not using the right advanced software and also maybe me need far more powerful computers to figure it out. I was inspired by the film "contact" where radio astronomers recieve a signal and decode the signal and create a 3 dimensional spherical matrix to construct a completely new space travel concept to take one person at speed of light to a nearby star and then after a brief visit to her father/ or some chap, gets immediately returned to earth... fastenating i thought... If only seti could achieve a discovery like that.... waheey that would be something.

 

heres a thought....

well we have the Internet with our technically advanced (somewhat advanced!!!) civilisation and we use satelitte broadband now, could these signals being relayed by satelittes somehow get deflected into space and detected by some advanced civilisation with some massive radio signal detector and significanty amplified and decoded into a recieved computer based communication. This extraterrestrial user could surely in theory communicate back.. if they had a way of sending the signal at a highly speeded up response....speed..

 

Sounds like you're on the right track. What's the frequency I should turn my reciever too?