Re: Space Station Jefferies
If I researched correctly then the TOS Starbases 4, 10 and 27 had been mentioned by dialogue, had not been shown (neither in EU materials) and are not necessarily a planet.
"The first duty of every Starfleet officer is to the truth" Jean-Luc Picard
"We can't solve problems by using the same kind of thinking we used when we created them." Albert Einstein