Virtual Reality is an inseparable element of today's information technology revolution. Man's innate desire for fantasizing has been sustained considerably by the advent of powerful computers. By mimicking reality most convincingly, virtual reality creates fascinating illusions and stimulates various human senses. This book throws light on the avenues open for exploring our universe - from the attainment of the Fantastic Voyage of Isaac Asimov to an evening stroll on the surface of Mars-all in a computer-generated virtual world.