Composite Image (IMAGE) DOE/US Department of Energy Caption NASA's Fermi Gamma-ray Space Telescope discovered the first pulsar that beams only in gamma rays. The pulsar (illustrated, inset) lies in the CTA 1 supernova remnant in Cepheus. Credit NASA/S. Pineault, DRAO 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.