Board Thread:General Discussion/@comment-2212553-20171210185236/@comment-24922135-20171211013318

I would've hoped they'd explain it in The 11th Alien, but no one has said anything so I assume it wasn't mentioned.

I think if they are going to explain it (which they should, this isn't the kind of thing that should be left up for fans to guess about) then it will likely be explained in the next plot-centric episodes, whenever those are.