Signals to and from exoplanets


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Message 1332677 - Posted: 30 Jan 2013, 6:48:07 UTC
Last modified: 30 Jan 2013, 6:48:37 UTC

maybe im not the first one to think of this but why arent we sending directed radio signals toward known exoplanets or pointing our radio telescopes at star systems with exoplanets to listen for signals? seems like that would be the most likely way of finding a signal.

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Message 1332681 - Posted: 30 Jan 2013, 7:03:07 UTC

We are, and have been for over 100 years.
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Message 1332767 - Posted: 30 Jan 2013, 13:09:12 UTC

euh... we dont
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Message 1332796 - Posted: 30 Jan 2013, 15:02:56 UTC

The SETI Institute is now using the Allen Telescope array to listen for signals from stars known or believed to have exo-planets. They use the lists compiled by the Kepler Space Telescope, and other exo-planet search projects.

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Message 1332816 - Posted: 30 Jan 2013, 15:39:04 UTC - in response to Message 1332796.

I think that, so far, we don't know of any Exoplanets that are likely to be Earth-like. Our count of planets will improve as time goes on.

How far away are these, and are we likely to pick up spurious emissions at these distances ?
I don't think that we are beaming any messages at the current time.

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Message 1332842 - Posted: 30 Jan 2013, 17:04:15 UTC

Its over 100 years since the people of earth started to transmit radio signals around our planet.
The first extra-terrestrial radio reception was a few years later, but we didn't know what it was as we didn't know how to even think about analysing it back then.
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Message 1332892 - Posted: 30 Jan 2013, 18:58:07 UTC - in response to Message 1332816.
Last modified: 30 Jan 2013, 19:00:51 UTC

I think that, so far, we don't know of any Exoplanets that are likely to be Earth-like. Our count of planets will improve as time goes on.

How far away are these, and are we likely to pick up spurious emissions at these distances ?
I don't think that we are beaming any messages at the current time.
Various exoplanet searches have detected both near and distant planets. Those in the Kepler field are typically about 300 to 3000 light years away, but this is not the only data used by the SETI Institute.
The most Earth-like planet (tentatively) detected is KOI (for Kepler Object of Interest) 172.02. It is only half again as large as Earth, and within it's star's habitable zone. Even in systems where an Earth-like planet has not been detected, the presence of larger planets suggests the possibility of smaller ones, just as Jupiter might be said to suggest the possibility of Earth's existence.
Detecting signals not intended for interstellar reception is worth considering for the nearer of known exoplanets. This would not be likely for planets in the Kepler field, given the receivers currently in use. Patience in listening might reveal a signal that is periodically sent our way, much as a lighthouse rotates its beam over all azimuthal angles.

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Message 1332976 - Posted: 30 Jan 2013, 22:49:01 UTC - in response to Message 1332892.

New definition of the “Goldilocks Zone” puts Earth right on the edge of habitability

New one??


'Habitable Zone' for Alien Planets, and Possibly Life, Redefined

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Message 1333434 - Posted: 1 Feb 2013, 6:28:21 UTC

I understand what you guys are saying but what is the reason for not sending deliberate signals to these star systems we know to have exoplanets. The only deliberate signal/message I could find information on was the Arecibo message sent in 1974. Why do we spend so much time listening and none sending?

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Message 1333435 - Posted: 1 Feb 2013, 6:41:40 UTC

There is a sizable group of people who don't think it is a good idea to alert other possible sentient beings to our presence without first making sure they are friendly. I'm not sure how that would be done but I guess it would be safe to err on the side of caution.

Besides it would cost mountains of money to transmit a signal with enough power at a specific target. Bottom line is we may be better off staying under the radar, so to speak.
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Message 1333440 - Posted: 1 Feb 2013, 6:48:41 UTC

Yeah after doing some more searching I found that there have been 24 deliberate signals sent with the first being the Arecibo message in 1974. I found the information on a Wiki page after searching for Active SETI.

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