Really like this idea!
Perhaps the ruins was the launch pad for the Guardians initial space travel endeavors. Also, that moon is beautifully rendered so this might be a thing.
If you're going by the historical data that's been found, an electromagnetic launcher would require a track miles long.
Instead think of it as a fixed antenna. This is a data center. Fixed antennas get the best reception for short periods of time allowing for large data dumps, such as updating and backing up archives between physical locations.