Abstract:
Super Massive Black Hole (SMBH) in the center of Milky Way galaxy (Sgr A*) is the closest one to the Earth. A unique feature of any black hole is the existence of an Event Horizon (EH). The EH represents the boundary of a space-time domain from which nothing, not even photons, may ever leave and reach an external observer. At the same time, accreting matter produces electromagnetic radiation in a wide frequency range which may be readily detected with nowadays radio-metric and space technologies, which gives a chance to measure the EH shadow shape. The presently available angular resolution allows us to measure even the shape of the shadow of the EH of the Sgr A * SMBH. Implementation of such an experiment will be Experimentum Crucis for proving the validity of General Relativity. These experiments are based on the use of multi-position Interferometers with a Very Large Base (VLBI).
     The talk briefly describes the above and related issues, such as: formation of the EH; existing Projects on the EH measuring; Event Horizon Telescope (EHT) Project, and, in some more detail, a new Project on

‘Event Horizon Imaging Experiment ’ (EHIE )

recently launched by European Space Agency (ESA ).