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Both stars and black holes vary is size. You probably guessed that. The smallest black holes are more massive than the smallest stars. Black holes, whose size is classified by mass, range in size from a few times the size (mass) of our sun to millions or billions (106 or 109) of times the mass of the sun. The largest stars are only a few hundred times the mass of the sun in comparison. Black holes are generally more massive, and will, therefore, have higher gravimetric fields than stars. Remember that the question asked about gravity, and gravity is all about mass. The smallest black holes are not very large while still having several times the mass of a star like our sun. A black hole a few tens of kikometers across with, say a dozen or two times the mass of our sun will meet the requisite "density" requirements for a black hole. Supermassive black holes like the ones thought to be in the center of some galaxies are the most massive objects known in the universe. Need links? You got 'em.

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