It is a Science Fiction Book. In the lock he unsnapped the hand propulsor from its bulkhead niche and clamped it to his wrist plate while the outer hatch swung open and the lock's air exploded into a void encrusted with a crisscross of vivid, vari-colored lines. The individual streaks, he estimated, averaged at least ten degrees in length. That indicated he was a reasonable period of time away from spillthrough into normal space where the lines would compress into the myriad normal pinpoints that were stars, undistorted by hyperspace perspective. When the streaks decreased to four or five degrees, he reminded himself, that was the time to start worrying about dropping out the bottom of the trough.