A plan to beam powerful radio messages to possible alien civilisations on distant planets has caused consternation among some scientists who believe it could spell doom for humanity on Earth.
Leading figures behind the 50-year-old Search for Extraterrestrial Intelligence (Seti), which uses radio telescopes to listen passively for unnatural signals from space, have now proposed an “active” form of search known as Meti – Messages to Extraterrestrial Intelligence. These signals will be aimed at the parts of the galaxy where Earth-like planets and life may exist, based on the growing number of “exoplanets” beyond our solar system identified by the Kepler space telescope, which include many in the so-called “habitable zone” of a star.
However, critics say the proposal betrays the founding principles of Seti, which were about listening rather than transmitting. They fear that sending signals of our existence could lead to visits from malign extraterrestrials intent on doing harm to humans. .. see more
source: Independent UK