HD 189733b (IMAGE) Johns Hopkins University Caption HD 189733 b has been the benchmark planet for atmospheric characterization since its discovery in 2005. Credit Roberto Molar Candanosa/Johns Hopkins University Usage Restrictions none License Original 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.