Eric Walker added Optical Gravitational Lensing Experiment - Wikipedia to Optical Gravitational Lensing Experiment (OGLE)

Eric Walker added Is There a Black Hole in Our Backyard? - The New York Times to a number of topics

Eric Walker added Optical Gravitational Lensing Experiment - Wikipedia and Is There a Black Hole in Our Backyard? - The New York Times to Optical Gravitational Lensing Experiment (OGLE), and added Optical Gravitational Lensing Experiment (OGLE) to Poland and Telescopes

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

Eric Walker added a number of topics and a number of links to Poland, and added Poland to a number of topics