Space exploration has always been about pushing boundaries, but perhaps the achievement which has most piqued a sense of possibility has been the exploration of Mars. Beginning with Soviet and American flybys in the early 1960s that were part and parcel of the Space Race, acclaimed space historian Piers Bizony continues through complete coverage of the Viking 1 and 2 missions of 19751976. Bizony also traces NASAs acclaimed rover program, describing the development, technologies, mission histories, and achievements of the rovers Sojourner, Opportunity, Spirit, and Curiosityall on the 25th anniversary of their first landing.