Raft is a science fiction novel by Stephen Baxter. The story of humans struggling to survive after being accidentally transported 500 years ago into a universe where the force of gravity is one billion times stronger than ours. Stars are only a mile across, and burn out within a year, even people have a detectable gravity field

But their ramshackle wreck of a ship, the Raft, is in danger....

This is Stephen Baxter's first book; links and references to this imagined universe can be found in some of his other novels.