More than four decades have passed since a human first set foot on the Moon. Great strides have been made in our understanding of what is required to support an

Extending the spatial and temporal boundaries of human space flight is an important goal for the nation and for the National Aeronautics and Space Administratio

Derelict satellites, equipment and other debris orbiting Earth (aka space junk) have been accumulating for many decades and could damage or even possibly destro

The United States has publicly funded its human spaceflight program on a continuous basis for more than a half-century, through three wars and a half-dozen rece

In this definitive account of the quest to establish a human presence in lifeless outer space, award-winning space historian Robert Zimmerman reveals the great