 Given its velocity, this would have occurred 100 million years ago.However, the star seems to be at most 20 million years old, which implies that it is a blue straggler, a star born from the merger of a binary star system, which was earlier ejected from the center of the Milky Way.In order for this to happen, there must have originally been a three-star system, or else there were two black holes and just the two stars.