Aliens Could Send Messages Through the Stars, Scientist Says

Are extraterrestrials communicating with one another through variable stars? Probably not. But that doesn't change the fact that they could, according to University of Hawaii scientist John Learned. New Scientist says our galaxy contains about 500 Cepheid variables—giant pulsating stars. Astronomers know how many exist because these objects shine bright enough at the peak of their variability to be seen from as far as 60 million light years away. Learned says that highly advanced aliens could alter a Cepheid's rate of variability by blasting it with something of great energy, like a beam of neutrinos. If they could control the rate, they could encode binary 0's and 1's into the stars, and communicate across the galaxy. While the suggestion of galactic Internet may seem far-fetched—or outright preposterous—at least this is one hypothesis about aliens that scientists could check. Astronomers have studied the rates of variability in our galaxy's Cepheids for ...