Eartha and Astro are twins. Eartha stays in Earth while Astro rides on a spacecraft. Astro returned to Earth after 2 decades. Which of the following took place? A. Eartha is younger than Astro. B. Astro is younger than Eartha. C. There is no difference in their ages since they are twins.

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Frame of reference

In physics, a frame of reference is a coordinate system used to specify either the position or the orientation or velocity of a body. The origin of the coordinate acts as a reference point for measuring the position or relative motion of a body. The coordinate system can be a cartesian coordinate, cylindrical coordinate, or a polar coordinate.