The possibility of life on other planets has fascinated humanity for centuries, fueling both scientific inquiry and imaginative storytelling. With billions of stars in our galaxy alone, many of which host planets in their habitable zones, the potential for extraterrestrial life seems increasingly plausible. Scientists are exploring extreme environments on Earth, such as deep-sea vents and acidic lakes, to understand how life can thrive in conditions once thought inhospitable, suggesting that similar forms of life could exist elsewhere. Observations of Mars, the icy moons of Jupiter and Saturn, and exoplanets reveal tantalizing clues about diverse environments where life might emerge. As technology advances, the search for biosignatures and the study of alien atmospheres could bring us closer to discovering whether we are alone in the universe or just one of many forms of life in the vast cosmos.