the most popular science fiction books

'Gateway' is also very popular. Its exploration of human nature in the face of the unknown, along with the unique setting of the alien space station, has attracted a large number of readers. People are drawn to the mystery of the ships and the potential for discovery, as well as the well - developed characters.

'Wool' by Hugh Howey was quite popular too. It's set in a post - apocalyptic silo, and the mystery and the characters' struggles within that confined space were really engaging for readers. The story gradually unfolds, revealing more about the world outside the silo as it progresses, which kept readers hooked.

I'm not sure which ones are the most popular exactly, but 'Snow Crash' by Neal Stephenson is often highly regarded. It's set in a future where the world has been transformed by a new form of technology and virtual reality, and it has a really unique and engaging plot.

I'm not entirely sure which ones were the most popular, but 'Doomsday Book' was widely talked about. It had an interesting premise of time - traveling historians.

Another popular one could be 'The Uplift War'. It was part of a well - known series and had a lot of fans who were into the idea of the uplift concept, where lower species are 'uplifted' to sentience by higher ones. It had exciting battles and interesting alien species interactions.

Another popular one might be 'The Uplift War' by David Brin. It's part of a series and in 1989 it was attracting a lot of attention for its unique take on the evolution of intelligent species and the politics between them.

Well, 'Network Effect' was quite popular. Its popularity lies in its engaging protagonist, the Murderbot. People love following the adventures of this unique artificial intelligence character as it navigates complex relationships and dangerous situations.

Some of the most popular science fiction books include 'Dune' by Frank Herbert. It has a complex and immersive universe with political intrigue, unique ecosystems, and a messianic figure. Another is '1984' by George Orwell, which, while often considered dystopian, has strong science - fiction elements in its vision of a totalitarian future society. And 'The Hitchhiker's Guide to the Galaxy' by Douglas Adams is also very popular. It's a humorous take on space travel, with zany characters and absurd situations.

Another popular one was 'Seveneves'. Neal Stephenson is a well - known author, and this book with its epic story of humanity's struggle for survival in space got a lot of attention. It had complex scientific concepts and a huge scope that made it stand out among 2015 science fiction books.

Probably 'Neuromancer'. It was extremely popular as it introduced many concepts that became staples in cyberpunk. It was innovative and had a really cool aesthetic.