I used to have a creative writing professor who would not let his students ever write science fiction or fantasy. He would say, before you can learn to write about other worlds, you have to learn to write about simple people and simple conflicts. In effect, it tended to make stories more boring than they had to be, but his philosophy was sound.

The best sci-fi and fantasy are character-driven stories about people with simple desires and simple conflicts that just so happen to exist in fantastical settings and become enmeshed in complex conflicts.

Spin is just such a story; it is an interesting philosophical exploration of what would happen to the earth & humanity if we knew our extinction was coming in forty years. That, and the sci-fi stuff if you like that, is the lace to this story. What kept me reading was the simple love story at the heart of the book.

Also if you liked the philosophical exploration here, then you should check out Children of Men. The movie, which is better than the book, but the book too.