So at this point you may be wondering what the expected size of a black hole is. This is important, for if there are none of the expected black holes observed then the large scale effects of general relativity do not match theory, and relativity must be abandoned in favour of some new physics. This is not necessarily a problem. Theories are often, and indeed should be, rejected when their predictions do not match results. This is not a bad thing, but many scientists tend to find the concept of abandoning relativity as loathsome as dismissing evolution or plate tectonics. It is ingrained into their belief system and they will often fight intellectually against logical challenges with the blind ferocity of a fanatic. This is unfortunate since by engaging in blind defence of established theories, they abandon the basic virtues of the scientific method.