[quote=@Gunther]
<Snipped quote by HeySeuss>

Does this mean a sailor can walk the decks of a ship, while in "space" and breath air? Gravity?
[/quote]

Yes. It is more like the Astral Plane in a sense, than actual space. The ship has a power source (working on the stub) that powers what generate the gravity and atmosphere. There is limited power in these for weapons systems, atmosphere and gravity. Depending on how the ship moves, it draws power that takes away from speed. For example, turning, diving, ascending, moving in any way besides forward per the bow. Magicians can also draw considerable extra 'juice' from these power systems, so movement that conserves this 'fuel' is prioritized.

Also, the distances are not like Space as we know it. Stars and planets, sure, but not as we know them in space.