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How Big Are Black Holes? Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or "stuff," in an object. From our planet Planet only one man felt down into the Black holes and after sixty year, he returns in the same age. He became a popular after seeing his rocket. He was a young scientist. This is fiction about a man who goes journey in a whole universe. This is fiction bring you to journey into space if you read deeply.