Celestial sigils

My esteemed colleague Dr Lynley Wallis is having a Game of Thrones party for her (ahem) 30th birthday, in a few weeks. Great preparations are being made. These include sigils for every guest, using a generator found online. Of course mine has to have a space theme, easier said than done. Here are my two most successful drafts so far. I can't decide which direction to go in, so there may be some more experimentation.