Federation galaxy ship

A Federation galaxy ship was a series of Federation starships. These vessels were distinguished by Starfleet's intended purpose for them, which was to survive the limits of the Milky Way Galaxy and perform long term observation and exploration outside of the galaxy's borders.

These vessels were sometimes referred to as Galaxy-class, but this nomenclature has fallen into disuse since the origination of the similarly named of starship in the 24th century.

The galaxy ship project began in the later 23rd century, with several vessels being crewed and made ready to begin their missions in the early 2270s. One vessel, the USS Magellanic Clouds (someimes referred to as Magellan), was being readied for launch in 2270, under the command of a former USS Enterprise (NCC-1701) security chief, Commander Mandala Flynn. Several recent Starfleet Academy graduates were due to be assigned to her command, including Brian Silayna and Lieutenant Piper. 

By 2285, Flynn had been promoted to captain, with her mission underway. Rear Admiral James T. Kirk commented to Hikaru Sulu that if he had been a younger man at the outset of the galaxy ship program, he might have aspired for one of the vessels as well. By this point, Magellan had been joined by sister ships USS M-31 and USS Andromeda (galaxy ship). It was widely reported that Magellan had arrived at the Andromeda Galaxy and observed a supernova there later in that year.