My money's on this: barnacles on an airless high metal planet orbiting a black hole. (Extra cool if the black hole is the only stellar-sized object in the system)
I checked that out already .. but you know there are millions of square KM's to cover..
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They are found between 135 and 150lys from Merope, in the so called 'shell'. It's not a bubble because there are no UAs closer to Merope than 135 lys. It was the same in 1.4 too, they have not traveled since then.
Then I guess we should look 135-150ly's out from another black hole nearby.. could be more UA's out there?
I'd be interested in mapping any other black holes near by our civilized shell..
Taken from steam discussions
The ones I know about are as follows:
-HIP 63835 (3 black holes, around 200ly from Sol)
-11 Sagittae (1 black hole, around 400ly from Sol)
-HIP 100289 (1 black hole, around 300ly from Sol)
-HIP 28711 (1 black hole, around 400ly from Sol)
-40 Upsilon-2 Hydrae (1 black hole, around 250ly from Sol, also has a neutron star)
-HIP 19218 (1 black hole, around400 ly from Sol)
-HIP 47296 (2 black holes, around 400ly from Sol)
-HIP 103442 (3 black holes, around 1000ly from Sol)
-27 Gamma Cassiopeiae (1 black hole, around 550ly from Sol, also has a neutron star)
-Beta Muscae (1 black hole, around 300ly from Sol, also has a neutron star)
-Dabih Minor (3 black holes, around 270ly from Sol)
-HIP 18442 (3 black holes, around 650ly from Sol)
-HD 175514 (2 black holes, around 1100ly from Sol)
-Maia (1 black hole, around 400ly from Sol, inside the Pleiades Nebula)
-HR 1185 (1 black hole, around 400ly from Sol)
-HIP 37017 (1 black hole, around 400ly from Sol)
-HIP 34707 (1 black hole, around 140ly from Sol)
-p Puppis (1 black hole, around 200ly from Sol)
And of course:
-Sagittarius A* (1 Supermassive black hole, around 26,000ly from Sol at the Galactic Center)
-Great Annihilator (2 black holes, around 22,000ly from Sol near the Galactic Center)