As we know there have been numerous Terran Mirror Universe episodes in Star Trek. The question I have is this. Once a Terran Mirror Universe is created or accessed by the normal timeline, does the Terran Mirror Universe continue to exist once the normal time line leaves the mirror? Does the entire mirror of the Terran Universe timeline run parallel to the normal time line, just mirrored? Or is the Terran Universe a mirror of isolated incidents of the normal timeline and doesn't function as the normal timeline does? How would the Whale Probe be in a Terran timeline?