Mercury s core I thought Mercury s core is like about 75 Does outer core counts as inner core In the article it said the core is about 42 and Earth s core is 17 to me Earth s core is like possibly 35 isn t mercury s sky always black and the globe color is always gray That s what I ve learnt because lack of atmospehre From what I ve understood Mercury s atmosphere can not even achieve to Triton s level and most of its atmosphere is just fake gases Isn t Mercury s core hot at least 100 C