The search for alien life involves scientific efforts to discover evidence of life beyond Earth, whether it be microbial organisms on other planets, intelligent civilizations elsewhere in the universe, or any other form of extraterrestrial existence. For centuries, people have looked at the sky, questioning whether life exists beyond our planet. “Are we alone in the universe?” or “Do aliens exist?” are the questions. Although definitive proof of alien life has not yet been found, several approaches are being used to examine the possibilities.