A comprehensive, accessible, and stunningly illustrated introduction to these far-off worlds. The most distant planets in our solar system, Uranus and Neptune were unknown by the ancients--Uranus was discovered in the 1780s and Neptune only in the 1840s. Our discovery and observation of both planets have been hampered by their sheer distance from Earth: there has only been one close encounter, Voyager 2 in the late 1980s. The Voyager mission revealed many enticing details about the planets and their moons but also left many more questions unanswered. This book is an informative and accessible introduction to Uranus, Neptune, and their moons. It takes readers on a journey from discovery to the most recent observations made from space- and ground-based telescopes, and it will appeal to amateur and professional astronomers alike.