Eric Walker added ESO Instrument Finds Closest Black Hole to Earth | ESO to HR 6819 and MPG/ESO 2.2-metre telescope

Eric Walker added ESO Instrument Finds Closest Black Hole to Earth | ESO to HR 6819, and added HR 6819 to Black holes

Eric Walker added a number of topics and a number of links to Black holes, and added Black holes to Outer space