Are humans the only intelligent lif

Are humans the only intelligent life in the universe?Or,are we just one of many advanced civilizations out there? While people used to assume we were alone in the universe we now know that the galaxy contains over 100 billion stars This fact has led many scientists to thinkit unlikely that we are the only intelligent life form in the universe. Some of these scientists have devoted themselves to searching for other civilizations This search is commonly referred to as the Search for Extraterrestrial intelligence or SETI Since the SETI program began in 19s9, scientists have been scanning the sky for signals sent by another in Arecibo, Puerto alien civilization To do this, they use the worlds largest radio telescope which is located said that Rico The Arecibo telescope is 1.000 feet Gos meters) indiameter Thistelescope is so large. itis it could hold 10 billion bowlsof comflakes The telescope collects and sends data to Computers 24 hours a day them out any people donm realize that in addition to searching for radio waves we humans are sending also into space as well This is because all of the radio and televis signals that come into our homes radio travel space we have been constantly and unintentionally leaking waves into space over soty years now One day these signals may be detected an alien civilization in fact it ispossible by that aliens are already listening to Love Lu The Simpsons and American Idon Although SETI has found some unexplained signals there have not been any dear confirmed extraterrestrial si scientists are not at all discouraged They know that the universe is vast arid searching the entire sky for a distant signal is like searching for a needle in a haystack Not only are SETI scientists not discouraged, they ar actually more optimistic than ever before They do feel that in another 50 or 100 years they will have succeeded in detecting alien signals what is the reason for this confidence? Previous searches were limited by the shortcomings of available technology For example while there are hundreds of billions of stars in our galaxy, fewer than a thousand have been monitored for alien signals But technology is improving all the time.Astechnology improves scientists are going to have a better chance of picking up alien signals In the next few decades hundreds of thousands of stars, maybe even millions, will have been monitored