Best Hard Science-Fiction with Multiverse-Shattering Big Ideas (18 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 — 178,459 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 — 146,382 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 — 358,356 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 — 127,810 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
6	2001: A Space Odyssey (Space Odyssey, #1) by Arthur C. Clarke 4.18 avg rating — 332,818 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
6	Snow Crash by Neal Stephenson (Goodreads Author) 4.01 avg rating — 295,297 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
8	Rendezvous With Rama by Arthur C. Clarke 4.12 avg rating — 181,361 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
8	Dune by Frank Herbert 4.29 avg rating — 1,593,190 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
10	Brave New World by Aldous Huxley 3.99 avg rating — 2,040,966 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
10	The Left Hand of Darkness by Ursula K. Le Guin 4.10 avg rating — 214,097 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
12	Leviathan Wakes (The Expanse, #1) by James S.A. Corey (Goodreads Author) 4.31 avg rating — 310,195 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
12	Green Mars (Mars Trilogy, #2) by Kim Stanley Robinson 3.96 avg rating — 40,525 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
14	Homeland (Little Brother, #2) by Cory Doctorow (Goodreads Author) 3.96 avg rating — 9,580 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
14	Golden Witchbreed (Orthe, #1) by Mary Gentle 3.76 avg rating — 1,120 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
16	Accelerando by Charles Stross (Goodreads Author) 3.87 avg rating — 22,099 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
17	Usurper of the Sun by Housuke Nojiri 3.68 avg rating — 481 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
18	The Three-Body Problem (Remembrance of Earth’s Past, #1) by Liu Cixin (Goodreads Author) 4.08 avg rating — 474,270 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