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 MPG/ESO 2.2-metre telescope, and added MPG/ESO 2.2-metre telescope to Telescopes

Eric Walker added a number of topics to Telescopes, and added Telescopes to Telescopes, observatories and telescope networks