NOTE: UNSUAL TIME AND PLACEINSCRIPTION OBLIGATOIRE / MANDATORY SIGN-UP Alain Riazuelo - IAP Most relativistic effects, whether due to special relativity (aberration, Doppler effect) or general relativity (gravitational blueshift, distortion of light) have been extensively documented for decades. On the other hand, the works on visualization of these and the attempts to render them as […]

Farhad Yusef - Northwestern U. It is clear that an under-luminous supermassive black hole (Sgr A*) with a mass of 4.2 million solar mass lies at the center of the Galaxy. Precise measurements taken at radio and infrared wavelengths over the last two decades have led to this conclusion.  Recent studies indicate deviations from Keplerian motion of a […]