NASA''s first book on the Hubble Space Telescope marks the 20th anniversary of one of history''s most important scientific tools. Here is Hubble''s great visual legacy to humanity in stunning images that are benchmarks of astronomy and photography. Of the more than 100 classic Hubble images that were selected by NASA''s experts, the 20 most significant are accompanied by commentaries by notable scientists. Veteran astronauts from NASA''s five remarkable manned missions to maintain the telescope also contribute to this volume, making it an authoritative account of a magnificent scientific achievement.   Beyond its scientific contributions, twenty years of Hubble research and imagery--ranging from our planetary neighbors to the edge of time and space--have had a profound impact on the world''s imagination and spiritual growth, as documented in this inspiring book.