For nearly 17 years, astronomers working on one of Australia's most popular radio telescopes have been unable to explain where a strange signal comes from. They speculated at one point that even a signal of alien origin, coming from a very distant galaxy. Strange is the fact that this signal was not transmitted constantly. It only appeared a few times a year and could only be received within a radius of 5 kilometers around the observer. One of the first theories was that it was lightning that is somehow captured by a radio … [Read more...]