Dreaming the Void
by Peter F. Hamilton
At the center of the galaxy is the Dreaming Void, an artificial black hole that may hold paradise within its walls. When a human named Inigo begins dreaming of what lies within the Void, the word spreads, triggering a religious pilgrimage into the Void and possibly a catastrophic expansion that threatens the peace of the Commonwealth Universe.
by Dan Simmons
On the world called Hyperion, beyond the law of the Hegemony of Man, there waits the creature called the Shrike. There are those who worship it. There are those who fear it. And there are those who have vowed to destroy it.
by James S. A. Corey
When Captain Jim Holden's ice miner stumbles across a derelict, abandoned ship, he uncovers a secret that threatens to throw the entire system into war.
Old Man's War
by John Scalzi
The good news is that humanity finally made it into interstellar space. The bad news is that planets fit to live on are scarce - and alien races willing to fight us for them are common. So: we fight.
Shards of Honor
by Lois McMaster Bujold
Cordelia Naismith, Betan Survey Captain, was expecting the unexpected: hexapods, floating creatures, odd parasites. She was not, however, expecting to find hostile humans on an uninhabited planet. And she wasn't really expecting to fall in love with a 40-plus barbarian known to cosmopolitan galactics as the Butcher of Komarr.
by Robert Heinlein
In one of Heinleins most controversial bestsellers, a recruit of the future goes through the toughest boot camp in the universe and into battle with the Terran Mobile Infantry against mankinds most frightening enemy.
The Forever War
by Joe Haldeman
The Earth's leaders have drawn a line in the interstellar sand, despite the fact that the fierce alien enemy they would oppose is inscrutable, unconquerable, and very far away.
The Martian Chronicles
by Ray Bradbury
The first Earth people to attempt the colonization of Mars try to build their new world in the image of the civilization they left behind.
The Shadow of Saganami
by David Weber
A supposedly quiet outpost has been targeted by an unholy alliance between the slaveholders of Manpower, the rival star kingdoms of Mesa and Monica, and the bureaucrats of the Solarian League.