re:one AND five are correct
The rest are irrelevant.
Density of the atmosphere has more effect on the temperature than any of you people realize.
See this site:
http://www.windows.ucar.edu/tour/link=/kids_space/moontemp.html&edu=elem
The laws of physics work the same all over this part of the universe.
Its elementary, everyone should understand such simple facts.
IF the atmosphere is decreasing in density, then its temperature will go up OR down depending on the amount of radiation available in the area.
The average temperature, measured over long period of time, may remain the same.