Helix by Eric Brown

Helix is a fast-paced action adventure novel following the plight of four humans when they crashland on what they think is a desolate, ice-bound planet. Daylight brings the discovery that the planet is one of thousands arranged in a vast spiral wound about a central sun. They set off to discover a more habitable, Earth-like world and come across strange races of aliens, and life-threatening perils, on their way.