If you put a radio at ~10X the distance of Pluto, you can use the sun as a gravitational lens, and communicate with another star using milliwatts of power: htt

If you put a radio at ~10X the distance of Pluto, you can use the sun as a gravitational lens, and communicate with another star using milliwatts of power: http://www.centauri-dreams.org/?p=10123 http://www.centauri-dreams.org/?p=10123 You're still bound by the speed of light, unfortunately.