Why can light travel without a medium
unlike sound, which requires molecules to hit each other to transfer its energy, light has mass and is an object, called a photon, that is emitted and sent on its merry way in a direction that energy has sent it
Light is no different, it is just a property of vacuum. Just like sound is property of liquids, solids and gases. Another reasoning is that light is a type of electromagnetic radiation, which is amongst one of the four fundamental forces of nature and as such it do not require and any medium for propagation. for more reading http://www.alieneight.com/light-travel-through-space.htm
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