Astrobiology is the study of life in the universe, focusing on the origins, evolution, and potential existence of life beyond Earth. It combines elements of biology, chemistry, and astronomy to explore how life might arise in different environments, such as on Mars or the moons of Jupiter and Saturn. Researchers in astrobiology investigate extreme environments on Earth, like hydrothermal vents and acidic lakes, to understand how life can survive in harsh conditions. This knowledge helps scientists search for signs of life on other planets and moons, expanding our understanding of life's possibilities in the cosmos.