No, you are all missing the point.
Deep Space Knowledge is one of the new skills that was mentioned in the release notes. As I don't have it, I presume it must be an unlockable skill based on the new professions.
It has nothing to do with the message saying you can't enter deep space. You get that message because you're trying to fly a ship without a thruster into space (and apparently at other times in a rather weird way).
I am wondering who has this skill unlocked so that we can hopefully get at least a rough idea of what unlocks it and when.