The Great Beings are responsible for making a gigantic robot purposed to travel the universe, so it must have escaped the planet with appropriate velocity considering its mass. Not to mention the 3 T-series vehicles.
What type of propulsion it used and if it was capable of faster-than-light velocities in another question, but was it?
So did they ever and if not why, construct space sips to travel to Aqua and Bota Magna for research, or supply runs? After all Glatorian were fighting each other for scraps and water, whiel there was a huge "moon" filled with water.