Best Adult Science Fiction (29 books)

This means NOT YA Sci-fi. I think there should be a celebration between Sci-fi for adults and YA, I DON'T mean erotic sci-fi. But Sci-fi which might have adult themes and is good.

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1	Fahrenheit 451 by Ray Bradbury 3.97 avg rating — 2,855,833 ratings score: 388, and 4 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
2	Contact by Carl Sagan 4.15 avg rating — 152,913 ratings score: 296, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
3	Old Man's War (Old Man's War, #1) by John Scalzi (Goodreads Author) 4.23 avg rating — 225,531 ratings score: 288, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
4	The Werewolf Principle by Clifford D. Simak 3.77 avg rating — 1,832 ratings score: 200, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
5	Starship Troopers by Robert A. Heinlein 4.01 avg rating — 247,040 ratings score: 197, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
6	Foundation's Friends by Martin H. Greenberg (Editor) 4.19 avg rating — 3,681 ratings score: 100, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
6	Earth's Last War (Children of Destiny #1) by Glenn Van Dyke 3.52 avg rating — 60 ratings score: 100, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
6	Dune (Dune #1) by Frank Herbert 4.29 avg rating — 1,635,679 ratings score: 100, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
9	The Mount by Carol Emshwiller 3.65 avg rating — 1,633 ratings score: 99, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
9	Ready Player One (Ready Player One, #1) by Ernest Cline (Goodreads Author) 4.23 avg rating — 1,305,440 ratings score: 99, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
9	The Hammer of God by Arthur C. Clarke 3.71 avg rating — 9,405 ratings score: 99, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
12	The Forever War (The Forever War, #1) by Joe Haldeman 4.14 avg rating — 180,999 ratings score: 98, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
12	The Mote in God's Eye (Moties, #1) by Larry Niven 4.07 avg rating — 73,149 ratings score: 98, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
12	The Hitchhiker’s Guide to the Galaxy (Hitchhiker's Guide to the Galaxy, #1) by Douglas Adams 4.22 avg rating — 2,022,977 ratings score: 98, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
12	Ilium (Ilium, #1) by Dan Simmons 4.04 avg rating — 32,491 ratings score: 98, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
16	The Left Hand of Darkness by Ursula K. Le Guin 4.10 avg rating — 222,579 ratings score: 97, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
16	Redemption Ark (Revelation Space, #2) by Alastair Reynolds 4.16 avg rating — 32,625 ratings score: 97, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
18	The Girl, the Gold Watch & Everything by John D. MacDonald (Author) really liked it 4.00 avg rating — 2,216 ratings score: 96, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
18	Ender’s Game (Ender's Saga, #1) by Orson Scott Card 4.31 avg rating — 1,477,119 ratings score: 96, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
18	The Hollow Man by Dan Simmons 3.48 avg rating — 3,704 ratings score: 96, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
21	The Stainless Steel Rat (Stainless Steel Rat, #4) by Harry Harrison 3.92 avg rating — 16,716 ratings score: 95, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
21	Accelerando by Charles Stross (Goodreads Author) 3.87 avg rating — 22,368 ratings score: 95, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
23	The Uplift War (The Uplift Saga, #3) by David Brin (Goodreads Author) 4.07 avg rating — 27,442 ratings score: 94, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
23	The Long Earth (The Long Earth, #1) by Terry Pratchett 3.79 avg rating — 62,415 ratings score: 94, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
25	Where Late the Sweet Birds Sang by Kate Wilhelm 3.84 avg rating — 11,107 ratings score: 93, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
25	Pandora's Star (Commonwealth Saga, #1) by Peter F. Hamilton (Goodreads Author) 4.23 avg rating — 54,004 ratings score: 93, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
27	The Puppet Masters by Robert A. Heinlein 3.89 avg rating — 34,152 ratings score: 92, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
28	Crystal Singer (Crystal Singer, #1) by Anne McCaffrey 4.14 avg rating — 22,004 ratings score: 91, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
29	Sunburst by Phyllis Gotlieb 3.31 avg rating — 97 ratings score: 89, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars