The objects that Nick's teacher is referring to are called A. black holes. Black holes are indeed formed when a star collapses under its own gravity, resulting in an extremely dense area from which nothing, not even light, can escape.
Nick's teacher explained that there are certain objects that most likely exist at the center of every galaxy. These objects are so dense that their gravitational fields suck everything in, including light. They form when a galaxy or star collapses under the pull of its own gravity. Nick knows that these objects are called A. black holes. B. blue giants. C. nebulae. D. quasars.
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