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Difficulties and Challenges of Operations Research

рдорд╣рд░्рд╖ि рджुрд░्рд╡ाрд╕ा рдХा рдХ्рд░ोрдз рдФрд░ рдоाрддा рдХुंрддी рдХी рд╕ेрд╡ा: рдзैрд░्рдп, рдиिрд╖्рдаा рдФрд░ рднрдХ्рддि рдХी рдЕрдорд░ рдЧाрдеा

GMRT’s 8.8-Billion-Year-Old Hydrogen Signal: What Astronomers Found

GMRT (Giant Metrewave Radio Telescope) discovers the oldest known fossil radio galaxy trapped inside a cluster of galaxies