Summary
Deep Space Nine had the ability to move, but it required ingenious engineering tricks and risked tearing the station apart.
The Cardassians chose not to take the station with them as they had already depleted Bajor's resources and moving quickly would have posed difficulties.
Due to its strategic significance, Deep Space Nine remained stationary during the Dominion War, relying on enhanced defense capabilities to safeguard against potential attacks.
Deep Space Nine, the titular space station in Star Trek, possesses the ability to move in space, despite the significant effort required from its crew. Unlike previous Star Trek installments, DS9 broke convention by taking place on a stationary space station rather than a starship. This departure from tradition failed to win over some of the franchise's more devout fans. Due to its fixed position, DS9 relied on representatives from the wormhole to bring the wonders of new worlds to the station. However, as Commander Benjamin Sisko and his crew explored the Gamma Quadrant, DS9 quickly outgrew its original location, leading to the epic Dominion War storyline.
After a considerable period without a designated ship, DS9 acquired the USS Defiant, a vessel specifically designed for combat and reconnaissance missions. Although primarily meant for this purpose, in exceptional circumstances, Deep Space Nine could be relocated, as demonstrated in the DS9 pilot episode. Originally built as a Cardassian refinery, DS9 lacked the maneuverability of a Defiant or a starship like the Enterprise. Nevertheless, there were instances where shifting DS9's location became necessary, either by choice or due to catastrophic systems failures.
How Deep Space Nine Was Able To Move In Star Trek
In "Q-Less," Vash unknowingly activated an alien life form that caused Deep Space Nine's systems to power down, disrupting its orbit and sending it towards the wormhole. The show does not provide an explanation for how DS9 restores its position at the wormhole's entrance by the end of the episode. However, the answer lies in the Star Trek: Deep Space Nine pilot. In "Emissary," it is revealed that DS9 is equipped with thrusters specifically designed to maintain its orbit and adjust its trajectory in the event of interference by alien life forms trying to return home.
Chief O'Brien of Star Trek: Deep Space Nine utilized these thrusters to move DS9 towards the wormhole's entrance, thus claiming it for the Bajoran people. This was no simple task and required clever engineering techniques. O'Brien utilized the station's deflector shields to decrease its inertial mass, allowing it to achieve the necessary speeds for space travel. However, moving DS9 posed significant risks and nearly resulted in the station's destruction, which is why O'Brien chose not to attempt it again. Instead, the crew relied on the enhanced defensive capabilities of the station to protect their position at the mouth of the wormhole.
Why Star Trek's Cardassians Never Took DS9 With Them
Terok Nor was left behind by the Cardassians when they withdrew from Bajor, and it subsequently came under the control of the Bajorans and the Federation. Knowing that they couldn't bring the station with them, the Cardassians looted it and caused damage to its systems before returning to Cardassian territory. As a result, when O'Brien and Sisko arrived at DS9 in the beginning of "Emissary," they discovered it in a state of disrepair that would require extensive repairs throughout the first season of Star Trek: Deep Space Nine.
There were two main reasons why the Cardassians didn't take Terok Nor with them. Firstly, they had already depleted many of Bajor's mineral resources, so they had no need for a uridium ore refinery. Additionally, transporting such a massive station would have been incredibly difficult and time-consuming. O'Brien used all of his engineering skills just to move Deep Space Nine a short distance to the vicinity of the wormhole. Furthermore, the station's thrusters were not capable of achieving warp speed, meaning that interstellar travel was impossible.
Star Trek Only Moved DS9 In Extreme Circumstances
Star Trek: Legacy, a strategy game released in 2006, hinted that Deep Space Nine had returned to orbit above Bajor after the Dominion War, although this was never confirmed on-screen. However, in a DS9 episode of Star Trek: Lower Decks, the station was depicted in its original position at the mouth of the wormhole. Given the significant strain endured during the war to establish Bajor's control over the wormhole, it is not surprising that Deep Space Nine remained stationary, except for occasional incidents like Vash's homesick alien.
Even during the Dominion War, Deep Space Nine did not move from its position due to the strategic importance of the wormhole. Instead of enhancing the station's thrusters for mobility, Starfleet opted to bolster its defensive capabilities. This decision aimed to safeguard the extensive civilian population residing at DS9 and to uphold the station's vital location at the wormhole's entrance. The station's defenses proved formidable enough to prevent any physical retreat from Cardassian or Klingon threats throughout the entirety of Star Trek: Deep Space Nine's seven seasons.