[quote="darkhunter"]
The ons from an Alan Norse (I think) book I read once (can't remember the title--synopsis: young man finds what turns out to be an alien map showing the planet betweeen Mars and Jupiter before it turned into the Asteroid belt [sorry-last time I read it was over 20 years ago, and the science was right for the time it was written]. I seem to remember corporate warfare/piracy involved somehow...)
[quote]

Darkhunter, I believe the title is "Raiders From The Rings". A great, fun book, I wish that I could find a copy.

Robert Heinlein's Torch Ships were sphereical.

David.