There are 3 books in the Spin series. The newest book is Vortex which came out in 2011.

1
Spin

Book cover of Spin
After witnessing the onset of an astronomical event that has caused the sun to go black and the stars and moon to disappear, Tyler, Jason, and Diane learn that the darkness has been caused by a time-altering, alien-created artificial barrier and that the sun will be extinguished in less than…
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2
Axis

Book cover of Axis
Wildly praised by readers and critics alike, Robert Charles Wilson's Spin won science fiction's highest honor, the Hugo Award for Best Novel.
 
Now, in Spin's direct sequel, Wilson takes us to the "world next door"--the planet engineered by the mysterious Hypotheticals to support human life, and connected to Earth by…

3
Vortex

Book cover of Vortex

Vortex tells the story of Turk Findley, the protagonist introduced in Axis, who is transported ten thousand years into the future by the mysterious entities called "the Hypotheticals." In this future humanity exists on a chain of planets connected by Hypothetical gateways; but Earth itself is a dying world, effectively…