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 == 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. Thats what I've learnt, because lack of atmospehre. From what I've understood, Mercury's atmosphere cannot 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?    "