Eric Walker added Large Ultraviolet Optical Infrared Surveyor - Wikipedia to LUVOIR
Eric Walker added Some planets may be better for life than Earth | WSU Insider | Washington State University to a number of topics
Eric Walker added a number of topics to Observatories, and added Observatories to Telescopes, observatories and telescope networks
Eric Walker added a number of topics and a number of links to National Aeronautics and Space Administration (NASA), and added National Aeronautics and Space Administration (NASA) to Space travel, exploration and defense and Branches and agencies of the United States government