I don't know if this is a bug or working as intended, but my survey ship left Sol and discovered the system of Proxima Centauri. After conducting a grav survey and finding new unexplored jump points, it went through one and found itself back in Sol. Not a new Sol like the other posters, but the original Sol with my homeworld in it, meaning both Sol and Proxima Centauri now each have two jump points linking to the same system.
Not like several systems making a triangle or anything, but two direct connections between one pair of systems.
Game created in 1.7.1, patched to 1.7.3.