Galaxy map (IMAGE) University of Toronto Caption A map of galaxies in the local universe as seen by the Sloan Digital Sky Survey which the researchers used to test the axion theory. Each dot is the position of a galaxy and the Earth sits in the middle of the map. Credit Sloan Digital Sky Survey Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.