This book is an exposition of classical mechanics and relativity that addresses the question of whether it is possible to send probes to extrasolar systems. It examines largely well-understood physics to consider the possibility of exploring the nearby interstellar environment in a similar fashion to how the solar system has been explored. As such, this book is both a semipopularization of basic physics and an informal study of a likely future technological development. An auxilliary text on basic physics for students and laypersons as well as an illustration of the problems with interstellar exploration, this book is a must-read. Sample Chapter(s). Chapter 1: Exploration of Star Systems (74 KB). Contents: Newtonian Mechanics; The Physics of Rocketry and Spaceflight; Power Systems for Spaceflight; Elements of Astrodynamics; Special Relativity; The Relativistic Rocket; The Photon Sail; Scientific and Technical Requirements; Electromagnetically Accelerated Nano-bots; Exotic Propulsion Methods; The Interstellar Neighborhood; Will Humans go to the Stars?; Solar System Stability and the Likelihood of Earth-like Planets; Life on Earth and in the Universe. Readership: Undergraduate students in science and engineering, laypersons knowledgeable in these two areas.