Best Science Fiction

Please do not include fantasy, alternate history (unless you find a clear science fiction exception), or other speculative fiction genres. They will be removed. If you're unsure, use this list.

From Wikipedia:
"Science fiction is a genre of fiction dealing with imaginary but more or less plausible (or at least non-supernatural) content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities. [...] It is similar to, but differs from fantasy in that, within the context of the story, its imaginary elements are largely possible within scientifically established or scientifically postulated laws of nature (though some elements in a story might still be pure imaginative speculation)."

Some subgenres:
Alternate History
Dystopian and Post Apocalyptic Fiction
Space Opera
Steampunk

Award winners:
SF and Fantasy Award Winner Lists

Locus Recommended Science Fiction:
2015, 2014, 2013, 2012, 2011, 2010, 2009

Sci Fi Award Nominees
2016, 2015, 2014, 2013, 2012, 2011, 2010
2009, 2008, 2007, 2006

Science Fiction By Decade:
1930s, 1940s, 1950s, 1960s, 1970s, 1980s, 1990s, 2000s, 2010s

Most Popular Science Fiction on Goodreads:
All science fiction with at least 50,000 ratings
All science fiction with 25,000 to 49,999 ratings
All science fiction with 10,000 to 24,999 ratings
All science fiction with 1,000 to 9,999 ratings
All science fiction with 100 to 999 ratings
Best Science Fiction on Goodreads with less than 100 ratings