Kenri Shaun lists the hazards of interstellar travel:
"'...dark dwarf nebulae, black holes, or rogue planets.'" (p. 196)
Rogue planets play major roles in Anderson's "A Sun Invisible," Satan's World and Ensign Flandry; black holes in his "Kyrie" and For Love And Glory, but what is a dark dwarf nebula? Googling discloses dark dwarfs and dark nebulae but not dark dwarf nebulae. Is such a nebula one composed entirely of dark dwarf stars? That would indeed be a navigational hazard.
After some awesome detours (see recent posts), I am again rereading Starfarers and finding several linguistic and technical points to discuss, maybe in the next post.
