Some fascinating ideas about where SETI should look for signals. These long-distance calls being expensive, advanced civilizations are likely to keep it short and to the point…

One possibility of an extraterrestrial beacon is a puzzling transient radio source some 26,000 light-years from Earth that was discovered in 2002 in the direction of the galactic center. It sends out radio waves in bursts lasting up to 10 minutes in a 77-minute cycle.

Fun ideas. Read the whole story at Space.com.