Aliens or extraterrestrial life has been thought to have been plausible but there have been no evidence found to confirm it.Since the mid-20th century, there has been an ongoing search for signs of extraterrestrial life, from radios used to detect possible extraterrestrial signals, to telescopes used to search for potentially habitable extrasolar planets. The major hypothesized life to exist on other planetary body’s are Microorganisms that has only been hypothesized relies on physical life and consistent physical size.
The SETI program has failed to detect an intelligent radio signal after decades of effort which have decreased the optimism people have for the prevailing space age. The SETI program only uses resources when they can get them and only operate on a certain set of radio frequencies at the same time. They have concluded that even though there is a plentiful amount of planets there is still a big question mark floating out there whether or not there is actual aliens or not.