Best Hard Science-Fiction with Multiverse-Shattering Big Ideas

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 — 177,902 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 — 145,204 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 — 356,760 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 — 127,550 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 — 331,969 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 — 294,593 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 — 180,601 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 — 1,585,119 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 3.88 avg rating — 1,261,380 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 — 212,381 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 — 308,005 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 — 40,441 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 — 9,559 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 — 1,119 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 — 22,054 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 — 469,324 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