Elsewhere here, someone mentioned forever war in an entirely different context, but it caught my eye as I am finishing my third re-read of Joe Haldeman's book.

It combines the socio-political analyses of military science fiction, a la Heinlein's Starship Troopers, and prescient astrophysics in its 1975 use of 'collapsars' as multiply-connected blackholes' wormholes (my current intrigue).

Reading about the book, I noticed that its movie rights have been sold.

I wrote the production company suggesting Stanford U. Professor Leonardo Susskind as technical director. His mathematics of wormhole connected universes is entertaining and rigorous.