Hard science fiction focuses on scientific theories or grand theoretical ideas. There is a significant amount of real science (or theoretical) present in the book and an extreme attention to explaining it.Vote on the entries and/or submit your own suggestions to this list!
The public version of our Best Hard Science Fiction list (see URL below). Vote to rank the items and/or submit new books to the list. You can read more about what defines "HARD" science fiction here: http://bestsciencefictionbooks.com/hard-science-fiction.php