That was the whole reason they went on the museum adventure in episode 4, and the reason that Tic was trying to decypher the codes in episode 5. Hippolyta's golden solar system ties into it too. The big story pieces are there.
I think my issue is the times we've got to see Tic and Leti communicate with Christina has been really short formed. I have a the general idea from reading the book and how they dealt with Caleb.