Quote:
Originally Posted by Neverfly
See this thread.
In the meantime, our E.M. leakage is highly unlikely to be spotted by extraterrestrials.
The signal strength degrades so strongly that it's too weak to be recognized.
Frankly, we have much more to fear at home. |
The signals which are emitted from earth would be extremely weak, that is true, but they are very narrow bandwidth and modulated in a manner you would not see from a natural source.
One thing would be to have an antenna which is simply physically extremely very very large to focus them. This could be done at quite a distance though.
The question is are there any ET civilizations who are really really interested to find other civilizations in the galaxy? Interested enough to build enormous receivers and scan all the frequencies?
I don't think there's any doubt it could be done if they're within a couple hundred light years. IF they are though, they would have to be putting a lot of effort into listening.