A black hole's pull of gravity is so strong, no light escapes: https://t.co/LgUYfgonX6

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2 for 1 deal! Actually, it's 2 black holes merging into 1: http://t.co/ymZxzddNcv

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A black hole's pull of gravity is so strong, no light escapes: http://t.co/j7YejD8yaK

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