(VIA WION NEWS) Are we alone in this vast cosmos? if not, then how and when would we contact an extraterrestrial being. Given the vastness of the universe, there is little doubt that there are indeed other intelligent life forms out there but perhaps they also might be asking the same questions how to contact other civilizations.
The history of METI
Early attempts to contact life off Earth were quixotic messages in a bottle.
In 1972, NASA launched the Pioneer 10 spacecraft toward Jupiter carrying a plaque with a line drawing of a man and a woman and symbols to show where the craft originated. In 1977, NASA followed this up with the famous Golden Record attached to the Voyager 1 spacecraft.
These spacecraft — as well as their twins, Pioneer 11 and Voyager 2 — have now all left the solar system. But in the immensity of space, the odds that these or any other physical objects will be found are fantastically minuscule.
Electromagnetic radiation is a much more effective beacon.
Astronomers beamed the first radio message designed for alien ears from the Arecibo Observatory in Puerto Rico in 1974. The series of 1s and 0s was designed to convey simple information about humanity and biology and was sent toward the globular cluster M13. Since M13 is 25,000 light-years away, you shouldn’t hold your breath for a reply.
In addition to these purposeful attempts at sending a message to aliens, wayward signals from television and radio broadcasts have been leaking into space for nearly a century. This ever-expanding bubble of earthly babble has already reached millions of stars. But there is a big difference between a focused blast of radio waves from a giant telescope and diffuse leakage — the weak signal from a show like “I Love Lucy” fades below the hum of radiation left over from the Big Bang soon after it leaves the solar system.