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Compression waves, such as sound, cannot move through space due to the lack of a medium. Transverse waves, such as light and radiation, can move through a vacuum such as space. This is related to Einstein's theory of relativity, in which he states that Mass and Energy are the same thing. Essentially, transverse waves, which move at the speed of light, are moving fast enough to metaphorically be their own medium, as stated by the equation E=MC2 (Energy traveling at the speed of light is what we call a photon, which is a very hard concept to explain. The best I can do off the top of my head is that it's almost like it's matter and energy at the same time). Since the energy is it's own medium, the energy can travel through a vacuum, where there is no other medium to support it.

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