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Gloomy tales http://www.trainingfortransformation.ie/index.php/write-term-papers-for-money-10 management accounting assignment help This answers a mystery that has been confounding astronomers for some time -- why some black holes appear to be surprisingly dim. Black holes form when massive stars die and the gravity is so strong that not even light can escape. The gravitational force of black holes can be measured by X-ray emissions, which indicate how much heat is generated.