Image of PKS 2155-304 (IMAGE) Tata Institute of Fundamental Research Caption Astrosat was pointed at a target, PKS 2155-304, a special type of quasar, for its first light. The targeted object is an X-ray source, belonging to an enigmatic class of supermassive black holes in a galaxy 1.5 billion light years away. Credit TIFR Usage Restrictions Credit-TIFR 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.