Wouldn't all inertial reference frames that are observing the force of gravitational attraction between themselves and an object accelerating in a direction opposite to its absolute velocity vector will register a minimum force of attraction at the same time, which would signal the object having...
Einstein's theory of relativity is based on the fact that all motion is relative, which precludes the existence of a universally defined state of rest (priviledged reference frame). Einstein also recognises the existence of rest mass. If an object were at its rest mass, wouldn't it be perfectly...