You may have heard of the cosmic microwave background (CMB) before - it is leftover thermal radiation from when the Universe was young and opaque, and we see it in every direction we look in space. We'll talk a lot more about it in module 13, but in the meantime...below is a spectrum of the cosmic microwave background. Can you use it to estimate the CMB's current temperature? Tip: Watch out for units!

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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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