In the past decade, one of the most intriguing concepts to emerge in astrobiology is the idea of a “shadow biosphere”—a hidden layer of life forms existing alongside familiar Earth-based organisms, potentially using radically different biochemistry. This notion, while on the surface appearing speculative, is taken seriously by some scientists as a hypothesis that could reshape our understanding of what life is and how it might evolve. But how much of this is grounded in scientific evidence, and how much remains in the realm of science fiction? The Origins of the Shadow Biosphere Concept The term “shadow biosphere” was popularized…
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