The more baryons there are in the universe (a higher density of baryonic matter), the lower the ratio of deuterium to hydrogen is. therefore, if harry measures a higher ratio of deuterium to hydrogen than sally, harry infers:
a) the same density of baryons as sally.
b) a lower density of baryons than sally.
c) a higher density of baryons than sally.

that would be b i just took the test : )

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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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