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Along with escape velocity and sphere of influence considerations, one also needs to account for solar radiation pressure and the body's gravity field when analyzing orbital mechanics around small bodies. Due to the relatively large ratio of magnitude of solar radiation pressure acceleration vs. gravity (since the gravity is so small), the only ~stable ...


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The astronaut will be accelerated by the gravitational pull of the body they are passing, but they won't "feel" it in a qualitative sense like they do during an engine burn. This is because the gravity assist applies a force to the entire spaceship and everything inside in a uniform manner - gravity pulls on every part of you, from your head to ...


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If the only acceleration is due to the large mass's gravity, and the mass is not exceptionally large, or exceptionally close (i.e. close approach to a black hole or a neutron star), the astronaut will not experience any noticeable acceleration relative to the spacecraft. Gravity affects the spacecraft and the astronaut nearly identically, and the ...


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As an addendum to the other answers, the GPS in a typical smartphone will not work in space--or more specifically orbit--because consumer GPS units have restrictions placed in their firmware which prevent their functioning above a certain altitude and/or speed. A military or scientific-grade GPS would still function though, and GPS is in fact used by many ...


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