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Special Relativity - Which reference frame experiences which time?
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[QUOTE="AronYstad, post: 6871160, member: 734390"] What I meant was that since we describe everything on Earth as one object, Earth, then, since the Earth and the dwarf planet have the same reference frame and velocity, why can't we describe them as one single object. Although now, once I have thought about it for a bit, I guess that it's because the situation is simplified in such a way that the Earth is one solid object which is at one point in space at a time, and the dwarf planet is also described as one solid object that is also at one point in space at a time. And an event can't be spread out over space, so the situation has to be described like that to get any useful information. [/QUOTE]
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Special Relativity - Which reference frame experiences which time?
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