Aurora
by Kim Stanley Robinson | 
Antarctica
by Kim Stanley Robinson | 
New York 2140
by Kim Stanley Robinson | 
The Memory of Whiteness
by Kim Stanley Robinson | 
The Planet on the Table
by Kim Stanley Robinson | 
Contact
by Carl Sagan | 
Solaris
by Stanislaw Lem | 
Dark Space
by Jasper T. Scott | 
Seveneves
by Neal Stephenson | 
Green Mars
by Kim Stanley Robinson | 
Dark World
by B. V. Larson | 
The Speed of Dark
by Elizabeth Moon | 
The Circle
by Dave Eggers | 
Children of Time
by Adrian Tchaikovsky | 
Soft Apocalypse
by Will McIntosh | 
The End of Mr. Y
by Scarlett Thomas | 
Night Lords
by Aaron Dembski-Bowden | 
The Sculpted Ship
by K. M. O'Brien | 
An Ocean Is a Snowflake, Four Billion Miles Away
by John Barnes | 
Into the Forest
by Jean Hegland |
On the North Pole of Pluto there stands an enigma: a huge circle of standing blocks of ice, built on the pattern of Earth's Stonehenge--but ten times the size, standing alone at the farthest reaches of the Solar System. What is it? Who came there to build it?