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:...
"It's" is short for "it is".
"Its" is what belongs to "it".
Your use of "it's" when you meant "its" is extremely grating and diminishes any recommendations you make.
You must be fun at parties.