Covers of the Hubble iBook (IMAGE) NASA/Goddard Space Flight Center Caption Covers of the Hubble iBook "Discoveries" and the James Webb Space Telescope iBook "Science Guide." Credit STScI 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.