Alien life forms refer to any living organisms that may exist outside of Earth. Scientists search for these life forms in various environments, such as on other planets, moons, and even in the vastness of space. The study of astrobiology focuses on understanding the potential for life beyond our planet, examining extreme conditions on Earth to find clues about how life might survive elsewhere. The search for alien life includes exploring places like Mars, where signs of past water have been found, and Europa, a moon of Jupiter believed to have a subsurface ocean. Missions like the Mars Rover and telescopes scanning distant exoplanets aim to gather evidence of life, whether microbial or more complex.