During much of the Cold War, America's first line of defense was in outer space: a network of secret satellites that could provide instant warning of an enemy m

"Sentinels of the Sun: Forecasting Space Weather". This book takes an in-depth look at how space weather affects us. Authors Barbara Poppe with Kristen Jorden.

From a master of science fiction comes this brilliant collection of short stories featuring "The Sentinel," the story that inspired his classic "2001: A Space O