Six million horsepower from a reactor the size of a 55 gallon drum. This was the promise of the ultimate in all-American 60's muscle - the nuclear thermal rocket engine. With it, you could send jumbo jet sized payloads to the Moon, or send a crew to Mars in 3 months.

James A. Dewar's exhaustively researched work (there are 91 pages of footnotes) shows both the technical and political sides of the 18 year effort to develop the nuclear rocket. Like the space program itself, the nuclear rocket program was a creature of the Washington political process.

While lacking the polish of a David McCullough, Dewar does a good job of introducing the cast of characters and their competing visions for America's technologic and social future.

Dewar's thesis is that the nuclear engine was feasible and would have revolutionized space travel, boosting mankind into a 2001 Space Odyssey. I found his viewpoint to be refreshing, especially in contrast to the dour visions of historians such as Richard Rhodes. He devotes Appendix D of the book to "safety and environmental aspects of testing."

Perhaps the most poignant vision one gets from reading the book is that of the turning of a page in American history. With the end of Apollo and the nuclear engine project in 1973 we go from an era of limitless promise, to an era of sharply limited outcomes.