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ধরো, O পৃথিবীর কেন্দ্র এবং ভর, ( M=5.975 times 10^ 24 ~kg, R_ OE =6371 ) ( km . R_ OB =6400 ~km, BD=8.848 ~km ) এবং ( G=6.673 times 10^ -11 ) ( Nm^ 2 ~kg^ -2 ) | Suva Ai