This weekend in Washington, D.C., NASA and Carnegie Science are celebrating a centennial discovery at the 245th meeting of the American Astronomical Society. It is Edwin Hubble’s discovery with his telescope in 1923 of a star outside of the Milky Way Galaxy, which is home to our Earth. Previously, most astronomers had thought our galaxy was the only one in our universe so the edge of our Milky Way Galaxy was the edge of the universe. Instead, Hubble’s discovery of... Read more