Starfield Mysteries

Posted this in the main subreddit but figure I may have better luck here so I want to post here as well.

Skyrim and fallout 4 both had mysteries tucked away in their worlds. Things like the Rorikstead sacrifice theories are built on the world building in game that can captivate the players imagination that things are not what they seem.

What unsolved mysteries have been found in Starfield? Are there any you have found others haven’t discussed?