Building and maintaining a Space Station like ISS is very expensive and engineering vise very complicated. I propose hydrogen filled Space Station. Compared to 408km altitude of ISS it would have 50km. It would be robot operated and for safety measure it would be above a sea or an ocean. It would compensate for atmospheric drag using its hydrogen propulsion engines. It would be build using multiple sections like ISS, so balloons need precise positioning system on them to rendezvous and lock together. It would be solar powered but hydrogen fuel cells can also be utilized. It will be periodically resupplied with hydrogen. A platform like the offshore oil platforms would be generating hydrogen from the sea and transfer it to the station using balloons. The station would accommodate telescopes and other scientific research equipment onboard. Because of its fixed position relative to ground, communication to and from it would be higher bandwidth than ISS. Multiple Balloon Borne Space Stations can be deployed around the world. Balloons will be cascaded together to increase the lifting capacity that enables a space launch platform to be mounted. LEO micro satellites can be launched from these stations at a lower cost.
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