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How can black holes be massive but not big?

Updated: 8/21/2019
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When something in science is said to be massive, it does not refer to the object's physical dimensions; it refers to the object's mass, which is the amount of matter it contains. A black hole is an object, usually a dead star, that has completely collapsed under the force of its own gravity to a single point. The "size" of a black hole is often measure by the radius of the event horizon. For a black hole 3 times the mass of the sun, which is about the lower limit, the event horizon would be about 11 miles in diameter.

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Q: How can black holes be massive but not big?
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