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If ET's were doing SETI on their planet, would they detect ours?

Good question. I've wondered something similar myself, about why we aren't trying to contact the ET in addition to trying to find them. Since there's a bit of latency in the transmissions, maybe it would be good to start now. 😉
 
Because of all of the radio, TV, microwave, radar, etc., communications occurring constantly on earth and between earth and its satellites, the earth emits a very strong and complex set of radio signals into space every second of every day that could possibly be detected by intelligent civilizations on other planets.

Plus there have been numerous signals transmitted from earth for the sole purpose of describing our solar system and basic aspects of our biology into space. One of the first signals was sent from Aricebo in 1974 towards globular cluster M13.
 
Originally posted by: OhioDude
Plus there have been numerous signals transmitted from earth for the sole purpose of describing our solar system and basic aspects of our biology into space. One of the first signals was sent from Aricebo in 1974 towards globular cluster M13.
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Wow, so we have been doing that already. Shows how much I know about this. Very cool, anyway. 😀
 
Directed signals have been sent. For a short time. When they get there in thousands of years, they will be very weak. If ET is not pointing their telescope in our direction during that short period of time, the signal will be past them, gone.

Our day to day, non-directed signals could possibly be detected from the nearest solar systems. (Weak signal)

I'm not sure on the figures with todays technology, but when I read about, it would take something like ALL of our power consumption to send powerful directed signals.

The length of TIME involved, is the kicker. To improve your odds you would have to send for thousands to millions of years. The speed of the signal (light) is just too slow.
 
"Chances of aliens finding Earth disappearing ..."

David Chandler wrote an interesting article where he quotes Dr. Frank Drake as follows, "A pioneer of the search for extraterrestrial intelligence (SETI) has warned that for any intelligent aliens trying to search for us, "the Earth is going to disappear" very soon."

The concept of analyzing frequencies around the "water hole" (a frequency band between 1420 and 1721 megahertz) makes a pretty big assumption about what an intelligent ET might broadcast. Only "Type I" civilizations, like Earth, would be looking for ET in this manner. Contact will probably be with "Type II or III" civilizations and we probably can't even imagine what techniques they might use.

Dr. Karen Kolehmainen has her lecture outline available via a pdf file that address this issue.
Check it out: Life in the Cosmos
 
Originally posted by: Cawchy87
If there was a planet exactly like earth, would seti detect it?
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yes, if they where looking and in many many years, our first television broadcasts have only recently reached the nearest star to our solar system. Any signals we discover will likely be hundreds (if not longer) of years old.
 
The length of TIME involved, is the kicker. To improve your odds you would have to send for thousands to millions of years. The speed of the signal (light) is just too slow.
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Exactly.

Our civilization has only been actively and abuntantly utilizing radio wave communications for around 60 to 70 years. That means that an extra-terrestrial civilization would have to exist within 60 to 70 light-years from earth and have the intelligence and desire to examine and decipher that communication. What would 70 year old radio wave communications tell an extra-terrestrial civilization about us?

Considering the size of our galaxy (not to mention the universe), 70 light years is an infantesimal distance. Consider the 1974 signal sent in the direction of globular cluster M13. M13 is 25,000 light years from us, give or take a few hundred light years. By the time an intelligent species near M13 receives that signal, we will have long since destroyed this planet. (A fatalistic view, but probably the inevitable result of our existence...)
 
Unless of course other Civilizations have discovered a way to "bend" quantum time with a ship.

Only thing that would explain ship sightings.
 
Originally posted by: dmcowen674
Unless of course other Civilizations have discovered a way to "bend" quantum time with a ship.

Only thing that would explain ship sightings.
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1. If a Civilization discovered a way to "bend" quantum time, do you really suppose they would need to use a ship as we think of a ship?

2. There is at least one other thing that would explain ship sightings.
 
Anyone remember the signnal power used for that signal in 1974?
Wasn't it in the Terrawatts range?
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20 terawatts

Yes, that's 20,000,000,000,000 watts. :Q

Once it reaches M13, they estimate that the signal will appear to be about 10,000,000 times more powerful than the normal amount of radio wave radiation given off by our sun at that distance. So it would definitely appear "abnormal" to anyone (or anything) in that area of the galaxy who might be listening at that moment.

Here's a little more information about that message from the SETI Institute.
 
One of the first signals thought to have been shot out was the Olympic Games that were held in Germany in the 1936. People are always wondering(& hoping), that aliens see the competition & spirit, & not the racism & hatred that encircled those events.
 
The problem with those short, directed signals is that if alien science is anything like ours, even if they received such signals, they would have to be discarded because they were never seen again. There have been a few "interesting" signals received by SETI, but because they were seen only once, nobody can prove they originated from extraterrestrial intellegences. 🙁
 
Originally posted by: Coquito
One of the first signals thought to have been shot out was the Olympic Games that were held in Germany in the 1936. People are always wondering(& hoping), that aliens see the competition & spirit, & not the racism & hatred that encircled those events.
Click to expand...



According to SETI:

Our earliest TV broadcasts have reached several thousand nearby stars, although any alien viewers would have to build a very large antenna (thousands of acres in size) to detect them.
Click to expand...

That, however, is not taking into account alien technology...
 
The broadcast was particularly powerful because it used Arecibo's megawatt transmitter attached to its 305 meter antenna. The latter concentrates the transmitter energy by beaming it into a very small patch of sky. The emission was equivalent to a 20 trillion watt omnidirectional broadcast

Ah I get it ,they used the gain of the antenna to give a 20Tw signal.
The actual power input would of been far less ,but its still a poweful signal nonetheless🙂

I always wonder how many of my CB radio signals escaped into space 😉 hehe ,though Darkone's signals would of stood a better chance!😛
 
Originally posted by: Ken_g6
The problem with those short, directed signals is that if alien science is anything like ours, even if they received such signals, they would have to be discarded because they were never seen again. There have been a few "interesting" signals received by SETI, but because they were seen only once, nobody can prove they originated from extraterrestrial intellegences. 🙁
Click to expand...

This signal sent in May 1999 may stand a better chance then🙂.......... I just noticed thats the same month S@H was released!
 
does that mean I not only used to key over you over the whole of southern england, but I also keyed over you into outer space ?! 😛

A Megawatt you say.... well i used to do a Kilowatt, so i guess ive a little way to go still huh! 😛

D

PS: it was my 5th Seti B/day on Monday!!!

Registered on: Mon Oct 18 08:52:54 1999 UTC

 
A "D1" sighting ... someone call MUFON! 😛 😀

Smoke waves at Darkone :beer:
 
hehe ,he can be poked into here from time to time😉

Btw MUFON??😕

Darkone
Happy 5th SETI Anniversay to you too Stu 😀
 
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