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The International Space Station is in low Earth orbit, only about 400 km above the surface according to this page, or about 1.063 time Earth's radius. This means that, air resistance aside, getting the International Space Station to escape the Earth's gravitational pull would be nearly as difficult as launching a payload with the same mass from the Earth's ...


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To first order, no. The definition of an orbit is that it's a free-fall trajectory — since everything around you is always experiencing the same acceleration as you are, you cannot actually perceive this acceleration without some external reference (like measuring your velocity compared to the Earth, and how fast it changes). That said, the closer ...


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When you are in a synchronous circular orbit, the gravitational force equals the radial force, at all times. If the orbit is elliptical, the variations in the orbit will translate into force variations. Whether these variations would be perceived by humans, depends on how "elliptical" the orbit is, and how close to other celestial bodies the orbit takes ...



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