Ihave two questions i need with. 1. if earth's mass is 20% higher, how long would it take earth's orbital period around the sun? (in days/years ) 3. if the earth was 20 million years farther from the sun, how will our year length change?

1).  The Earth would need much much much much much more mass than it has in order to see any change in our orbital period around the sun.  An increase of 20% won't jhave any effect.

3). This question isn't clear. "years" isn't a unit of length or distance. It can't describe a change in our distance from the sun, so we don't know what this question is actually asking.

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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