The covers of NASA's two new ebooks on the Hubble and James Webb telescopes. (Image: NASA/ESA)
NASA has just released two free ebooks about the Hubble Space Telescope and its not-yet-launched successor, with interactive features that let readers watch a galaxy collision or manipulate a telescope model between pages, agency officials say.
The Hubble Space Telescope launched in 1990 and has a mission lifetime through at least 2013. The space-based observatory has supplied some of the most dazzling visible-light images of distant cosmic objects, which are featured in "Hubble Space Telescope: Discoveries."