The obvious technical issue is that you need a store of liquid oxygen on board for the actual space bit of the journey - as you need something to burn the hydrogen with once the air gets too thin. Saves you the cost of a space launcher that you only use once. Many ships have Vertical Take Off Or Landing (VTOL) capabilities these babies, though, can use a regular runway too. ![]() ![]() In essence, a spaceship that can take off and land like an aircraft, as well as also looking like an aircraft.
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