Alien beings are hypothetical life forms that originate from planets or celestial bodies outside of Earth. They are often depicted in science fiction as having various physical appearances, abilities, and technologies. Scientists search for evidence of alien life through programs like SETI (Search for Extraterrestrial Intelligence) and by studying extreme environments on Earth where life thrives. The concept of alien beings raises questions about the possibility of life beyond our planet. Researchers explore the conditions necessary for life, such as water and suitable temperatures, and investigate planets like Mars and moons like Europa for signs of microbial life.