FI and I are sci fi nerds and are having a (classy) space/night sky themed wedding. We're mixing constellations into our decor and having a Doctor Who themed guestbook, etc. I have found some pretty constellation wedding invitations, but I just feel like I'm going to look back at my invites and think they looked kiddish or kitschy (I don't now, but I worry I might in the future, or that guests will think that). Would it be weird to have an invite completely unrelated to the theme? Will people be confused about our theme if we don't include it in the invites?