Journey into a Schwarzschild black hole http://jila.colorado.edu/~ajsh/inside... The simplest kind of black hole is a Schwarzschild black hole, which is a black hole with mass, but with no electric charge, and no spin. Karl Schwarzschild discovered this black hole geometry at the close of 1915, within weeks of Einstein presenting his final theory of General Relativity.
Black Hole Hunters https://www.nytimes.com/2015/06/09/sc... Known as the Event Horizon Telescope, named after the point of no return in a black hole, its job was to see what has been until now unseeable: an exquisitely small, dark circle of nothing, a tiny shadow in the glow of radiation at the center of the Milky Way galaxy.