Book excerpt: This stunning collection of images illustrates the incredible impact the Gemini space missions had on science and the amazing crew and spacecraft that were instrumental to the program's success. Essential facts obtained from official NASA documents detail the science involved in reaching Earth's orbit and remaining in space for days at a time and provide insight into the data gleaned during the Gemini missions that eventually led to landing on the Moon. Comprehensive and succinct, this guide to the Gemini missions will appeal to both new and old space enthusiasts.