Most Federation space stations, such as Spacedock, are huge structures that dwarf the average starship.
The Federation's primary spacedock is the massive station orbiting Earth, providing service facilities for
Starfleet vessels. The USS Enterprise NCC-1701 returned to Spacedock in 2285 following the battle with Khan in
the Mutara Nebula. At the time, the ship was scheduled to be scrapped, but Captain James Kirk stole the
Enterprise from Spacedock in an effort to rescue Spock. Also stationed at Spacedock at the time was the USS
Excelsior NX-2000, undergoing tests of its experimental transwarp drive. In an alternate reality created by a
timestream, the Yellowstone-class runabout prototype USS Yellowstone NX-74751 was stolen from Spacedock in 2372
by Ensign Harry Kim and Tom Paris.
The Spacedock model was designed by David Carson and Nilo Rodis, and was built at Industrial Light and Magic.
The model was re-used more than once in Star Trek: The Next Generation, notably for Starbase 74 in "11001001".
In the Voyager episode "Non Sequitur" the only shot of Spacedock was the doors, which was a reuse of the Dyson
Sphere doors from "Relics" - TNG.
- Star Trek Encyclopedia.
This enormous space station orbiting Earth provides a valuable base for vessels operating in the Terran
Spacedock is essentially the shape of a very large mushroom, and was an impressive sight. Its enormous structure
allowed ships to dock inside the top part of the station, and it had the capacity to hold many large vessels at
once. Beneath the docking area, the station narrowed into a long stem. However, even at its narrowest point,
Spacedock is significantly wider than even the largest Federation vessel.
Spacedock's main function is to provide a base from which to launch new vessels and undertake various upgrades
and repairs on older vessels. It also provides facilities for serving Starfleet vessels while allowing the crew
to take a vacation on Earth. The same design was used for other stations throughout the Federation; for example,
Starbase 74 is almost indistinguishable from Earth Spacedock.