Hubble’s observations have made new and significant scientific contributions to virtually every area of astronomy. Its detailed imagery of the Cat’s Eye Nebula (NGC 6543), for example, revealed more intricate structures than ever imagined. This complex planetary nebula is suspected to surround a binary star that created its multiple gas shells, shockwaves, and stellar jets. The NASA ebooks can be downloaded from https://science.nasa.gov/mission/hubble/multimedia/e-books/