Interorbital Systems Corporation (IOS) is an American aerospace company based in Mojave, California.

It was founded in 1996. Interorbital Systems is working on a line of launch vehicles aimed at winning the Google Lunar X Prize. The company was also a competitor for both the Ansari X-Prize  and America's Space Prize. 

Interorbital Systems' prototypes are all designed to be amphibious (capable of launch from land or sea). Although IOS currently tests its spacecraft at the Mojave Airport & Spaceport and conducts testbed launches from the Mojave Desert, it plans to develop and implement a method for launching directly from the water without a launch platform. 

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