Some of the interstellar gas in our Galaxy has been heated to millions of degrees, a temperature that surprised astronomers when it was first discovered. How do we now think that gas between stars gets that hot?

Explanation:

As the gases in the galaxy contracts due to the gravitational pull due to which the pressure inside the lump of gases increases, by the ideal gas equation, Pressure is directly proportional to the temperature, so the temperature of the gas lump increases.

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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