However, according to physics as currently understood, the speed of light, 299,792,458 meters per second, is in reality an absolute barrier. Anything with mass must travel below this speed. Massless objects (such as photons) must always travel at this speed in a vacuum, as must electromagnetic radiation. Certain theories postulate that there could be a class of particles (known as tachyons) which travel faster than the speed of light, but these could not slow down to below this speed, or interact with particles below the limit. These particles would have an imaginary mass.
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