The main source of heat for planets is via sunlight. We maintain our temperatures because of our atmopshere. Being so close to the sun and being such a small planet (thus small graviational pull), mercury can't maintain much of an atmopshere...and the thus the heat is lost to space.
-173C? What is that in actual numbers? And yes, I know the conversion formula to F, buy there's no reason to have to use it. You should just post using sensible units in the first place.
It isn't dumb, it's physics. 32 and 212 degrees are the points where there is the proper amount of energy involved for water to change state. And it doesn't matter if everyone else uses Celsius, most of the world does a lot of foolish things like referring to soccer as football. They're wrong on both counts.
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