There have been plenty of indirect observations such as their jets, stars in very tight orbits around Sagittarius A*, xray binaries etc. This is a direct obser

There have been plenty of indirect observations such as their jets, stars in very tight orbits around Sagittarius A*, xray binaries etc. This is a direct observation of the immediate environment of a black hole, i.e. its accretion disk and other light bent around it.