Radio? Who needs a radio?!
Mock.
Yeah!
Ing.
Yeah!
Bird.
Yeah!
Yeah.
Yeah!
Then there us Hope.
Generation ships, here we come!
Can I have a pet Glieseian when our spaceship gets back from there with samples? Can I? Can I?
You mean like Krikkit?
Once they developed radio and machines that can fly above the clouds, sure. The occasional meteorite strike could also clue them in. For that matter, the day/night cycle and thermodynamics would also clue them in about their sun existing if nothing else.
I doubt that any planet of Gliese 581 has a technological civilization. If there were a technological civilization that close to us, I suspect we’d know by now. We would probably have picked up radio transmissions from them. I would dearly love to be proven wrong on this.
If the planet is tidally locked to its star, there wouldn’t be a day-night cycle.
But then, in another year, they’ll get Achy Breaky Heart. They’ll invade for sure then. It won’t be much consolation to us that invading won’t get that song out of their heads.
If they came to Pittsburgh, at least the spotty cloud cover wouldn’t be a problem. Not this year, anyway.
We’re doomed!!!
Have you ever been doomed before?
Let’s leave a giant granite Monolith. You know, just as a goof…
My guess is that we here on Earth won’t be sending out radio waves for much longer, universe-time-wise. Maybe another couple hundred years, for a three hundred year total run of blasting radio waves out into space. We’ll have something better by then.
So looking for radio waves for civilizations ‘out there,’ while fun, and we might as well, doesn’t disprove technological civilization.
I think much better evidence is lack of us having been colonized.
Yeah, the Arachnotrons are a bitch.
I don’t know. I was thinking about this in the shower this morning. We don’t seem to be giving up wireless transmissions. In fact, we’re more dependent on our mobile phones than we were twenty years ago. I don’t see us giving up mobile phones without some collapse-of-civilization type event.
Of course, I could be wrong. I obviously don’t know what path technology will take in the future. I know even less about what path technology might have taken on planets around other stars.
That could just mean that sending ships to other star systems isn’t economically feasible.
Cell towers don’t radiate 100,000 Watts as do radio stations. 
Let’s turn this around. Anyone farther than 100 light years from us wouldn’t be getting any radio signals from our planet yet. And 99.99%+ of the Universe is farther than that from us.
Even a radio station with an Effective Radiated Power (EWP) rating of 100 kW is actually radiating at only about 10-30 kW and would not provide a coherent signal at interplanetary, much less interstellar, distances.
The discovery of Gliese 581 g as being a rocky world falling into a potential habitable zone was publicized in September of last year. Referring to the world or conditions upon it as “Earth-like” is a stretch at best; it is more accurate to say that it is a world that probably has a solid surface on which liquid water could be present. There are likely better candidates for worlds that could support the development of Earth-like life that we are simply not capable of observing yet, but there is little reason to believe that the composition of our solar system is unique or special. It is also entirely possible that self-organizing, auto-replicating, thermodynamic- regulating systems could come to exist in conditions that are nothing like terrestrial conditions, giving caution to constraining any hypothesis or search for life that is constrained to Earth-like conditions.
Stranger
Totally unfair debating tactic. You’re a girl, so mentioning yourself in the shower is automatically distracting. Now I can’t talk about anything that requires thinking.
They already have heard You light up my life.
These guys are well on their way and they are pissed. 
This should scare them from invading, performed 20 years ago.
“Mommy, I found this picture of you in the attic. Did you used to sing in a rock band?”
“Well, yes, I did. That was a long time ago, before I even met your daddy.”
“What was the band called?”
“Ummmmmm…have you finished your homework yet?”