Why do black holes have such a large gravitational field?

The strength of the gravitational field depends on the mass, and on the distance. Since in black holes, the mass is concentrated in a very small region of space, it is possible to get very close, and still have all the mass on one side.

Please note that at a given distance, say 100 million kilometers, a black hole with a certain mass has exactly the same gravitational field as a star of the same mass, at the same distance.

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explanation:

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colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.