By Paul C. W. Davies
On April eight, 1960, a tender American astronomer, Frank Drake, became a radio telescope towards the famous person Tau Ceti and listened for a number of hours to work out if he may possibly discover any synthetic radio signs. With this modest commence started a global venture of probably momentous importance. referred to as SETI - look for Extraterrestrial Intelligence - it's an amalgam of technological know-how, know-how, event, interest and a daring imaginative and prescient of humanity's future. Drake has stated that SETI can be a look for ourselves - who we're and what our position may be within the grand cosmic scheme of items. but with one tantalizing exception, SETI has produced simply unfavorable effects. After hundreds of thousands of hours spent eavesdropping at the cosmos astronomers have detected simply the eerie sound of silence. What does that suggest? Are we in truth by myself within the vastness of the universe? Is ET available in the market, yet now not sending any messages our approach? may possibly we be surrounded through messages we easily don't realize? Is SETI a waste of time and cash, or may still we press forward with new and extra delicate antennas? Or glance in different places? And if a sign have been to be got, what then? How may we - or maybe may still we - reply?