I & others have Posted remarks similar to the following. It would be interesting to me & probably to others to get current opinions on feasibility. Suppose there is a technological culture similar to ours on a planet orbiting Proxima Centauri, which is circa 4.3 light years from us. Could we communicate with it? Could we detect their communications? Our orbital speed is circa 30 Kilometers per second (or 18.5 miles per second). 108,000 km per hour (67,000 Miles per hour). A planet with technology orbiting Proxima Centauri is likely to have a similar orbital speed. Note that over a distance of 4.3 light years, a signal like our radio or TV technology diminishes via an inverse square law. Such signals would not be detectable at that distance. BTW: Our technology is tending toward FIOS or the current Comcast communications. There will likely be a time in the not too distant future when none of our ordinary broadcast signals could be picked up by equipment on Luna. Ordinary broadcast signals from a technological culture orbiting a star light years distant are likely to become (or already be) similarly undetectable at the Earth to Luna distance. It seems to me that directed signals (Google Aricebo) would have to be extremely precisely aimed to be detected by receivers circa 4.3 light years from the transmitters. Considering the orbital motions, this seems like a difficult task.