I'm currently watching Matter of Time. Besides noticing that this episode states that phasers and warp coils don't exist in the 22nd century, I'm wondering what now happens 200 years later.
Historians must know, there was a time traveler in the 26th century, who traveled back to the 22nd century and met a man named Rasmussen who then murdered him. For this not to be true, the bureau of temporal investigations would have had to get involved and highly classify or eliminate all mention of Rasmussen. In the 26th century, there must be some historian who is compelled to go back in time and be murdered to preserve the timeline. He possibly even collected the timeship that appeared in the 22nd century and sent it back to his own time before going further back in time to be murdered.
But it's the 26th century, so other options are available. Like, replacing him at the last moment with a non-sentient biological duplicate. (Which actually they could probably do at any time to preserve historical figures by replacing them at the moment of their death.)
Historians must know, there was a time traveler in the 26th century, who traveled back to the 22nd century and met a man named Rasmussen who then murdered him. For this not to be true, the bureau of temporal investigations would have had to get involved and highly classify or eliminate all mention of Rasmussen. In the 26th century, there must be some historian who is compelled to go back in time and be murdered to preserve the timeline. He possibly even collected the timeship that appeared in the 22nd century and sent it back to his own time before going further back in time to be murdered.
But it's the 26th century, so other options are available. Like, replacing him at the last moment with a non-sentient biological duplicate. (Which actually they could probably do at any time to preserve historical figures by replacing them at the moment of their death.)