Searches for Black Holes. the Most Recent Results
  Black holes were predicted by Einstein General Relativity (GR). Because of unusual properties of these objects their existence is almost unbelievable. There are gravitation theories which do not predict the black hole appearance. By now, astronomers discovered a few hundreds of massive and highly compact objects with observational features which are very similar to the properties of black holes predicted by GR. To confirm existence of black holes in the Universe, a number of groundbased and space experiments are planned to be held in the coming decade. 
A.M. Cherepashchuk