The Search for Extraterrestrial Intelligence (SETI) has been an ongoing endeavour for the last 50 years. Detecting radio communications from an alien civilization would be the most profound event in mankind’s history; its effect would change the way we view our origin and our place in the Universe. It could mean that far from “being alone” we could be existing in a cosmic ecosystem, where life is more common than not and advanced extraterrestrial civilizations are no longer science fiction. A positive SETI signal would affect us globally; science, religion, society, daily life would alter radically.
Unfortunately, SETI is currently drawing up blanks. Apart from one or two inconclusive signs, it looks like we live in a dead part of the galaxy. Life As We Know It™ is an Earth-only affair. Who knows, we might be searching for another five decades and still be no closer to answering the question “are we alone?”
Not to be too downhearted, scientists have been trying to make our presence felt by reversing SETI; we’ve been Messaging Extraterrestrial Intelligence (METI, a.k.a. “Active-SETI”) ever since we attached a plaque depicting the human form and a handy galactic map to Earth to the side of the Pioneer probes in the 1970s. Now we send a variety of radio signals to the stars in the hope of attracting ET’s attention.
But what signal do we send? Do we send a message with only good stuff from Earth? Or should we send a more gritty message, detailing our flaws as well as achievements? What actually makes a “good” METI signal in the first place?
Perhaps SETI could take some advice from the evolving social media scene, after all, when done right, there’s no more efficient way of conveying a clear message via 140 characters or less…