A black dwarf was a stellar remnant, specifically a white dwarf that had cooled sufficiently to no longer emit significant heat or light. Obviously, the time between the deaths of the stars that these dwarf stars originated from were billions of years apart. That's how long a white dwarf took to become a black dwarf.
Nevertheless, these two dwarf stars still found a way to be close to each other and entered a cycle together that seemed to be almost perpetual. Roan sighed and then ignored the white dwarf. As much as he would rather wish it was not there, he knew that the black dwarf rotating with it was the one his Dark Starlight was looking for. 'Let's get over with it.'