I picked this book up on a $0.99 Kindle sale a few weeks ago. Just thought I'd throw out a recommendation for it, if you're interested in "realistic" sci-fi.
It's not the best book I've ever read (many parts of the plot really need a lot more development IMO), but I think its depiction of space combat is absolutely fantastic, and very likely will be a pretty accurate portrayal of what battles in space ultimately look like. We're so used to seeing space combat depicted as just dogfighting and close range slug fests. This book was absolutely fascinating to me, because battles start off more like submarine warfare - hours and hours spent maneuvering and trying to detect your enemies without being detected, ships engaging at ranges of tens of millions of kilometers, with the speed of light being the real limiting factor on sensors and determining who/what you can target.
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