Aliens—also known as extraterrestrial life—refer to life forms that originate beyond Earth. The concept of aliens has fascinated humanity for centuries, appearing in ancient myths, religious texts, modern science fiction, and scientific inquiry alike. From UFO sightings and alleged abductions to advanced theories in astrobiology and interstellar travel, the topic of aliens spans both speculative belief and serious scientific investigation. Researchers continue to explore the possibility of alien life through space missions, radio signal detection (like SETI), and the study of exoplanets in habitable zones. Some believe ancient civilizations had contact with extraterrestrials, pointing to unexplained artifacts and structures as potential evidence. Others focus on the potential for microbial life on planets like Mars or moons like Europa.