Redefining Life: Integrating Biology, Chemistry, and Planetary Science in Modern Astrobiology

Abstract:

Astrobiology has emerged as a transformative scientific discipline seeking to understand the origin, evolution, distribution, and future of life in the universe. Traditional biological definitions of life, largely shaped by terrestrial organisms, are increasingly challenged by discoveries in planetary science, extremophile biology, and prebiotic chemistry. Modern astrobiology integrates biology, chemistry, geology, and planetary science to reassess what constitutes life and where it might exist beyond Earth. Advances in molecular biology, space exploration, and planetary observation reveal that life may arise in diverse environments, including icy moons, subsurface oceans, and exoplanetary atmospheres. This review examines how interdisciplinary research is reshaping the definition of life, explores chemical pathways toward biological complexity, evaluates planetary environments capable of supporting life, and discusses emerging technologies guiding future astrobiological exploration. Redefining life in a universal context not only influences space exploration but also deepens our understanding of life’s resilience and diversity on Earth.