Cepheid Variable Star RS Puppis (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption RS Puppis, one of the most luminous Cepheid variable stars, rhythmically brightens and dims over a six-week cycle. Credit NASA, ESA, Hubble Heritage Team (STScI/AURA)-Hubble/Europe Collaboration. Link to original photo: https://hubblesite.org/contents/media/images/2013/51/3263-Image.html 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.