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How Many Black Holes Are There? |
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Answer» We do not know for sure, 100%, that there are any BLACK holes. However, beyond reasonable doubt, when the compact OBJECT in an Xray BINARY system is shown to be more massive than about 3 times the mass of the Sun, then this compact object is a black hole. With regard how MANY there are in total, it is thought that many, perhaps most; galaxies contain a massive black hole in their centers. If this is the case, then there will be almost as many black holes as galaxies a great NUMBER! We do not know for sure, 100%, that there are any black holes. However, beyond reasonable doubt, when the compact object in an Xray binary system is shown to be more massive than about 3 times the mass of the Sun, then this compact object is a black hole. With regard how many there are in total, it is thought that many, perhaps most; galaxies contain a massive black hole in their centers. If this is the case, then there will be almost as many black holes as galaxies a great number! |
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