They're the ones that are embedded in that sea of dark matter that are causing the bending of the light to cause these optical illusions, or mirages, practically, of the background galaxies.
Need on needsamad mis on selle tumeaine mere sees mis põhjustavad valguse paindumise tekitades sellised optilised illusioonid, või miraažid, praktiliselt, taustgalaktikatest.