![]() ![]() ![]() ![]() Proxima Centaurithe nearest star outside the Solar Systemis about four light-years away. In other words, a comet at such a distance is superluminal in a geostatic, and therefore non-inertial, frame.Ĭomets may have orbits which take them out to more than AU. If a laser beam is swept across a distant object, the spot of laser light can easily be made to move across the object at a speed greater than c. The rate at which two objects in motion in a single frame of reference get closer together is called the mutual or closing speed. This may approach twice the speed of light, as in the case of two particles travelling at close to the speed of light in opposite directions with respect to the reference frame. ![]()
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