translation.en: 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.
translation.zh: 它们嵌在一团暗物质中 因而引起了光的弯曲 引起了这些视错觉，或者差不多，蜃景， 来自后面的星系。