DG hard and slightly less hard science fiction

Description
There are many favorites like them, but these are mine
1
The Martian
by Andy Weir
22,887 members
1,381 reviews
½ 4.3
Member
dglenn87
2
We Are Legion (We Are Bob)
by Dennis E. Taylor
2,599 members
116 reviews
4
Member
dglenn87
3
Seveneves
by Neal Stephenson
5,811 members
294 reviews
3.8
Member
dglenn87
4
Recursion
by Blake Crouch
4,716 members
249 reviews
4
Member
dglenn87
5
Saturn Run
by John Sandford
1,038 members
60 reviews
3.8
Member
dglenn87
6
Influx
by Daniel Suarez
856 members
51 reviews
½ 3.7
Member
dglenn87
7
The Quantum Magician
by Derek Künsken
405 members
14 reviews
½ 3.7
Member
dglenn87
8
Columbus Day
by Craig Alanson
651 members
32 reviews
3.8
Member
dglenn87
9
The Three-Body Problem
by Cixin Liu
12,484 members
530 reviews
3.8
Member
dglenn87
10
The Forever War
by Joe Haldeman
10,427 members
272 reviews
4
Member
dglenn87
11
Hyperion
by Dan Simmons
13,816 members
307 reviews
4.2
Member
dglenn87
12
Children of Time
by Adrian Tchaikovsky
5,502 members
215 reviews
4.2
Member
dglenn87