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cianfa72 reacted to Dale's post in the thread B Does the gravitational distortion of mass still exist in the past? with
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Our planet is 4 dimensional, not 3 dimensional. In spacetime, the earth is not a 3D sphere with a diameter of ##13 \ 10^6\mathrm{\... -
cianfa72 reacted to Kostik's post in the thread A Does the EP imply that a free-falling observer follows a geodesic? with Like.
Never mind, it's obvious. In an inertial reference frame, a "free-falling particle" is simply one not acted upon by any forces, hence...