Ribbon in the Sky by Murray Leinster - Audiobook

Ribbon in the Sky by Murray Leinster.
Read in English by Phil Chenevert.
Med Service man Calhoun and his little sidekick Murgatroid run into another sizeable speed bump on their assigned visits to the planets of their sector to spread health. "It turned out afterward that somebody had punched the wrong button in a computer." and this time it was a real doozie mistake, sending them into the vast unknown areas of the universe with no way to get back.