3.95 avg rating — 60,301 ratings

"Good pop science about many of the problems of space travel and some solutions."

3.90 avg rating — 97 ratings

"About the problems and research going into space travel. More theoretical."

3.92 avg rating — 106 ratings

"Really great info about the nitty gritty of geology of Mars and exploring the planet. Already dated because of new info, though."

4.13 avg rating — 102 ratings

"Older but, but good theoretical and experimental overview of what might be possible."

3.81 avg rating — 267 ratings

4.11 avg rating — 57 ratings

3.78 avg rating — 9 ratings

3.73 avg rating — 437 ratings