Eric Walker added Carnegie Institution for Science - Wikipedia to Carnegie Observatories

Eric Walker added At the Edge of Time, a Litter of Galactic Puppies - The New York Times to a number of topics

Eric Walker added Carnegie Institution for Science - Wikipedia and At the Edge of Time, a Litter of Galactic Puppies - The New York Times to Carnegie Observatories, and added Carnegie Observatories to Observatories

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