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A frame of reference, accordingly to relativity, is a collection of particles, bound together by gravity, having the same momentum (I think!).
In physics, a frame of reference (or reference frame) may refer to a coordinate system used to represent and measure properties of objects, such as their position and orientation, at different moments of time. It may also refer to a set of axes used for such representation. In a weaker sense, a reference frame does not specify coordinates, but only defines the same 3-dimensional space for all moments of time such that the frame can distinguish objects at rest from those that are moving.In Einsteinian relativity, reference frames are used to specify the relationship between a moving observer and the phenomenon or phenomena under observation. In this context, the phrase often becomes "observational frame of reference" (or "observational reference frame"), which implies that the observer is at rest in the frame, although not necessarily located at its origin. A relativistic reference frame includes (or implies) the coordinate time, which does not correspond across different frames moving relatively each other. The situation thus differs from Galilean relativity, where all possible coordinate times are essentially equivalent.
Given that momentum seemingly has an infinite number of values, what are the chances of two particles being close together with the same momentum? In other words what are the chances of frames of reference forming? Vanishingly small I would think. This makes sense given that everything in the universe is constantly being accelerated (e.g. world spins, revolves around the sun, solar system spins etc.). In other words, it would appear there cannot exist anywhere in the universe a frame of reference which, by definition, has constant velocity.
A basketball is a spherical inflated ball used in a game of basketball.