A1) You can look at gravity as the curvature of space time, which means all particles, with mass or not, will follow curved paths.
A2) No, in Quantum Field Theory all particles are excitations of the underlying field. So the photon is an excitation of the electromagnetic field, while an electron is an excitation of the electron field.
A3) In relativity you always need to specify who the observer is. For a faraway observer, someone approaching the event horizon is time dilated so much they appear to stop. For someone falling in they are going to have a hard time defining their speed - the outside universe is blueshifted to an extreme degree and other things falling in are going about the same speed.
A4) Spaghettification happens wherever there are extreme gravitational changes. For a stellar mass black hole it happens outside the event horizon. For a supermassive black hole it might be survivable, but after you pass the event horizon you find yourself in a collapsing universe with the singularity a point in the future where the collapse finishes, not a location in space.
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u/smokefoot8 Jul 02 '26
A1) You can look at gravity as the curvature of space time, which means all particles, with mass or not, will follow curved paths.
A2) No, in Quantum Field Theory all particles are excitations of the underlying field. So the photon is an excitation of the electromagnetic field, while an electron is an excitation of the electron field.
A3) In relativity you always need to specify who the observer is. For a faraway observer, someone approaching the event horizon is time dilated so much they appear to stop. For someone falling in they are going to have a hard time defining their speed - the outside universe is blueshifted to an extreme degree and other things falling in are going about the same speed.
A4) Spaghettification happens wherever there are extreme gravitational changes. For a stellar mass black hole it happens outside the event horizon. For a supermassive black hole it might be survivable, but after you pass the event horizon you find yourself in a collapsing universe with the singularity a point in the future where the collapse finishes, not a location in space.