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There is no answer to that question specifically. Atmosphere aside, reaching orbit requires that you have horizontal orbital velocity at your insertion velocity (e.g.: around 8.7 km/s at 140 km altitude). To do this, your stage or stages must provide you with a total change in velocity (hereafter called delta-V or dV) that is equal to that orbital velocity. ...


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This will be highly dependent on the characteristics of your fuel tanks, engines, and payload. A rocket uses stages because it's a good way to drop weight that's no longer needed, most notably, empty fuel tanks. A single-stage rocket approaching the end of its burn is still lugging around an almost-empty fuel tank. You could split that evenly into two stages,...


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