Get Google Newsfeed on the topic: The matter that builds black holes is so dense and have such high gravitation forces that noting can escape it and so it can not be seen. Actually it is the ash of a star that can not have any more molecular changes, like ash from coal will burn no more. The matter has reached a state that any molecular recombination do not release any energy.

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The matter that builds black holes is so dense and have such high gravitation forces that noting can escape it and so it can not be seen. Actually it is the ash of a star that can not have any more molecular changes, like ash from coal will burn no more. The matter has reached a state that any molecular recombination do not release any energy.