Nova by Samuel R. Delany

The balance of galactic power in the 31st century revolves around Illyrion, the most precious energy source in the universe. Captain Lorq van Ray's varied and exotic crew know their mission is dangerous, but they have no idea of Lorq's secret obsession: to gather Illyrion at source by flying through the very heart of an imploding star.
Binding: Paperback / softback