New Theories Dispute Existence of Black Holes — ‘Two U.S. scientists have questioned the existence of black holes and suggested, in their place, the existence of an exotic bubble of superdense matter, an object they call a gravastar. The two are pointing out that physicists have swept some “humiliating” problems with black holes under the carpet. By confronting these problems, they claim to have found an alternative fate for a collapsing star.’ Cosmiverse