This 1961 space exploration book has held up wonderfully well.
It tells of a time when humans are expanding through the solar system. Even poor young adventurers can go out by purchasing space-force surplus space suits and building styrene (plastic like) bubbles with ion drives.
Via the ion drives providing low but continuous solar powered thrust, once they are in low earth orbit, they can go most anywhere.
This book follows some interesting characters. Some of them don't amount to much but others manage to make things happen in a big way.
This is a classic SF story, well told with some pretty good characters. Even the 1961 projection of space science holds up with only the slightest amount of squinting.
I've enjoyed this book enough to reread it several times over the decades and expect to read it again.
I'd give it a good four stars out of five.