Best Hard Science-Fiction with Multiverse-Shattering Big Ideas (30 books)

What are your favorite hard science-fiction books that blew your mind?

They can be of any length.

They don't have to be strictly "hard", but the ideas should be approached with some rigor. The Wikipedia definition might be helpful: https://en.wikipedia.org/wiki/Hard_sc...

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1	The Forever War (The Forever War, #1) by Joe Haldeman 4.14 avg rating — 180,568 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
2	The Dispossessed: An Ambiguous Utopia by Ursula K. Le Guin 4.26 avg rating — 151,282 ratings score: 198, 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
3	Neuromancer (Sprawl #1) by William Gibson 3.89 avg rating — 364,635 ratings score: 196, 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
4	Ringworld (Ringworld #1) by Larry Niven 3.94 avg rating — 128,929 ratings score: 194, 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	Unju - The Jump by Gleneley Stander (Goodreads Author) 4.70 avg rating — 20 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
5	Greegs & Ladders by Zack Mitchell 3.09 avg rating — 280 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
5	American Survivor (Raven's Record #1) by Debbie Hightower (Goodreads Author) 4.79 avg rating — 71 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
8	The Invisible Dimension: Book 2 In The Greegs Universe by Zack Mitchell it was amazing 5.00 avg rating — 3 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
8	The Golden Rule by Debbie Hightower (Goodreads Author) 4.65 avg rating — 34 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
10	Equinox (Raven's Record #2) by Debbie Hightower (Goodreads Author) 4.89 avg rating — 9 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
11	Love You To the Moon and Back: An inspirational Science-fiction adventure by Debbie Hightower (Goodreads Author) 4.80 avg rating — 5 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
12	2001: A Space Odyssey (Space Odyssey, #1) by Arthur C. Clarke 4.18 avg rating — 336,486 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
12	Snow Crash by Neal Stephenson (Goodreads Author) 4.01 avg rating — 298,035 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
12	Babylon 20/20 by Debbie Hightower (Goodreads Author) 4.60 avg rating — 5 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
15	Rendezvous With Rama by Arthur C. Clarke 4.12 avg rating — 184,325 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
15	Dune by Frank Herbert 4.29 avg rating — 1,628,866 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
15	Raven's Revelation by Debbie Hightower (Goodreads Author) it was amazing 5.00 avg rating — 3 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
18	Brave New World by Aldous Huxley 3.99 avg rating — 2,079,105 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
18	The Left Hand of Darkness by Ursula K. Le Guin 4.10 avg rating — 220,880 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
18	Forged In Flames (Raven's Record #5) by Debbie Hightower (Goodreads Author) 4.67 avg rating — 3 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
21	Leviathan Wakes (The Expanse, #1) by James S.A. Corey (Goodreads Author) 4.31 avg rating — 319,388 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
21	Green Mars (Mars Trilogy, #2) by Kim Stanley Robinson 3.96 avg rating — 40,951 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
21	Kon-Tiki (Raven's Record #3) by Debbie Hightower (Goodreads Author) it was amazing 5.00 avg rating — 2 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
24	Homeland (Little Brother, #2) by Cory Doctorow (Goodreads Author) 3.96 avg rating — 9,639 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
24	Golden Witchbreed (Orthe, #1) by Mary Gentle 3.76 avg rating — 1,123 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
24	The Golden Rule: Book Four in Raven's Record series by Debbie Hightower (Goodreads Author) it was amazing 5.00 avg rating — 2 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
27	Accelerando by Charles Stross (Goodreads Author) 3.87 avg rating — 22,320 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
27	Babylon 20/20: A Dystopian Fiction Novel by Debbie Hightower (Goodreads Author) it was amazing 5.00 avg rating — 2 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	Usurper of the Sun by Housuke Nojiri 3.69 avg rating — 484 ratings score: 90, 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
30	The Three-Body Problem (Remembrance of Earth’s Past, #1) by Liu Cixin (Goodreads Author) 4.08 avg rating — 494,591 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