I was doing a bit of online searching for "The Complete Book of Outer Space", and found a number of hits I'd never came across before.
First off, the book is now mentioned on Wikipedia: "The Complete Book of Outer Space" / Wikipedia
This magazine/book is one of my favorite vintage publications. I still have my old dog-eared copy that my Dad gave me when I was a kid. So this next link may be of benefit to others; the entire contents uploaded on Scribd.com:
"Complete Book of Outer Space" / Scribd.com