Never played ToT have you duke? He is talking about Civ2.
To travel between worlds you need a suitable unit - unfortunately I'm at work and can't remember exactly what is required. You may need to move about a bit and try different places as it might be the terrain on the world you are trying to reach isn't suitable from the place you are trying to move from.
I'll try to place a more detailed answer when I get time.
I think you only use starports in the extended game although I have never played a future game for very long because of the stupid limit of not being able to talk to half the other civlizations... Its damn annoying when you have to fight them because you cannot meet them.
I haven't played the Sci-fi game buit if its like the extended then most units have to use a starport, a few have their own transport facility built in.
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