Eric Walker added Gaia (spacecraft) - Wikipedia to 2013 Gaia (spacecraft)
Eric Walker added Looking for Another Earth? Here Are 300 Million, Maybe - The New York Times to a number of topics
Eric Walker added a number of topics and a number of links to European Space Agency (ESA, ASE), and added European Space Agency (ESA, ASE) to Europe and Space travel, exploration and defense
Eric Walker added a number of topics and Maxar and Space telescope - Wikipedia to Space telescopes and research satellites, and added Space telescopes and research satellites to Artificial satellites, satellite networks, space stations and space missions and Telescopes