Most ecosystems on Earth heavily rely on sunlight for energy, but on some ocean worlds sunlight is absent, and chemosynthesis, not photosynthesis, could potentially enable life to thrive. While our Sun and solar system play a pivotal role in supporting life on Earth's surface, non-Earth-like planets may sustain life very differently. Ocean worlds can have unique geological features, such as hydrothermal vents and mineral-rich compositions, that could contribute to the environmental conditions necessary for complex life forms to emerge. Exploring the hypothetical scenario of an ocean world where life is sustained by chemosynthesis can push the boundaries of astrobiology and planetary science, and enable us to envision habitability beyond Earth's traditional parameters. New perspectives on ecosystems in the universe and the possible diversity of life can offer insights into the habitability of exoplanets (planets outside our solar system) and the potential for the emergence of life in the cosmos.

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