Extraterrestrial, which comes from the two Latin words in conjunction extra, meaning "beyond", or "not of" and terristris meaning "of or belonging to Earth". It is defined as life that exists beyond the earth that we know of. They are in other cases also referred to as aliens; these aliens can be in the form of simple unknown bacteria or other complex forms. It is a subject of great debate to whether extraterrestrials may exist or not, because no hard evidence have been made available to this date to support their existence. Although many renowned scientists have never given up hope, they believe that we live in a near infinite universe where there are significant possibilities of extraterrestrial existence. Many scientists have even ruled in their opinions by suggesting that some planets in our solar system may actually have the conditions to support life. Planets such as Venus, Mars, Jupiter’s moon Europa and Saturn’s moons Titan and Enceladus. According to Redfern (2004) “microbes could survive and reproduce, experts say, floating in the thick, cloudy atmosphere of Venus, protected by a sunscreen of sulphur compounds.” (p.1). There have also been speculations of extra-solar planets that may be suitable for life to exist.
Therefore we can also infer that, our solar system is not the only place for life to exist, but other extraterrestrials may still habituate in other planets outside our solar system. Whether primitive or intellectual, discovery of such extraterrestrials would bring about significant breakthrough in science and technology. Although such extraterrestrials have never been determined or found, many people still believe in them. These believers have their own logic behind extraterrestrials existence. Institutions such as NASA and SETI are among the very few donation dependent organizations which conduct active projects in order to search or seek out other forms of life existing outside this planet. Using high resolution telescope