There was a major collision of an asteroid with the moon in medieval times. it was described by monks at canterbury cathedral in england as a red glow on and around the moon. how long after the asteroid hit the moon, which is 3.84×105 km away, would the light first arrive on earth

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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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