A heavy bird sits in the middle of a clothesline. Will the tension in the clothesline be smaller if the line sags a lot or if it sags a little

when it gains or loses electrons

what is the actual question though?

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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