There is usually an alien ship, or possibly an independent colony at that spot.
What I may do, is to pick a nearby ship, either an exploration ship or a military ship. I then select it and zoom in on the circle. When really close (and the circle is no longer showing), I give the order to "move here". That should trigger the alien ship event that may be there.
I am just as likely to ignore it. If it has been there a long time, it is likely that some AI found it, and whatever was there has been picked up.
An alien ship can be a powerful fighting ship, or just a nice little research boost if you retire it at a spaceport.
OK, thanks !
ORIGINAL: Fishers of Men
If you are playing any of the story lines, these locations could advance them forward.
OK, I see ... Thank you