Obi wan hears the destruction of a planet and all of its people through 'the force'. these sounds are only in his head and are not carried through space, since space has no through which sound could transmit. electromagnetic wave electrons medium magnetic field

Medium, space is empty , sound needs some type of material to travel through.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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