The Hubble Tuning Fork (IMAGE) Royal Astronomical Society Caption The Hubble Tuning Fork illustrated with images of nearby galaxies from the Sloan Digital Sky Survey (SDSS). Credit Karen Masters, Sloan Digital Sky Survey Usage Restrictions None License Licensed content 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.