Search query: poul anderson world without stars

Product: Tau Zero
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This Hugo Award finalist, “justifiably regarded as a classic” (SFReviews.net), is the tale of an epic space voyage where time dilation goes horribly wrong.

Aboard the spacecraft Leonora Christine, fifty crewmembers, half men and half women, have embarked on a journey of discovery like no other to a planet thirty light-years away. Since their ship is not capable of traveling faster than light, the crew will be subject to the effects of time dilation and relativity. They will age five years on board the ship before reaching their destination, but thirty-three years will pass on Earth. Experienced scientists and researchers, they have come to terms with the time conditions of their space travel.

Until . . . the Leonora Christine passes through an uncharted nebula, which damages the engine, making it impossible to decelerate the ship on the second half of their trip. To survive, the crewmembers have no choice but to bypass their destination and continue to accelerate toward the speed of light. But how will they keep hope alive and maintain order as they hurtle deeper into space with time passing more and more rapidly, and their ultimate fate unknown?

With its combination of mind-blowing hard science and compelling human drama, Tau Zero is “the ultimate hard science novel” (Mike Resnick).

Product: The Last Viking Trilogy: The Golden Horn, The Road of the Sea Horse, and The Sign of the Raven
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The complete trilogy in one volume: An epic saga by an award-winning author about the daring life of the fierce Norse warrior-king Harald Hardrede.
Harald Hardrede, last and greatest of the Norse kings, matures from an uncrowned young man hungry for battle to a ruler with dreams of expansion he is determined to realize.

The Golden Horn: Only seventeen, Harald Sigurdharson—one day to be called Hardrede—covets the throne he is still too young to take. Restless, the warrior journeys to Constantinople where he becomes a member of the fabled Varangian Guard entrusted with the safety of the Byzantine emperor and romances an enticing beauty from a powerful clan.

The Road of the Sea Horse: Harald Hardrede, who has spent years serving foreign rulers in faraway realms, returns to Norway, undefeated and ready to grow his empire. Harald’s task to unite the northlands will be difficult and require great sacrifice, for the people will adamantly resist his invasion. But Harald will not be deterred; he is determined to carve out his place in history.

The Sign of the Raven: Harald has become a great king and a powerful conqueror, but his rule has become unstable. Treachery is brewing in the North and his conquest of Denmark is still out of reach. Unable to raise his wife’s downtrodden spirits or identify with his illegitimate sons, he sets out on his final adventure to seize the prize he has coveted above all others: the fortified island called Britannia.