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Canada's CHIME radio telescope detected a faint, 9-billion-year-old glow of hydrogen, validating a new method to map how matter is distributed across the universe. The technique could provide a powerful new tool for investigating dark energy and how the universe has expanded over time. The breakthrough represents a significant step for cosmology, giving researchers an additional independent method to study the universe's large-scale structure and refine understanding of the mysterious force driving its accelerating expansion.