The different star colours are for a reason. If you have heard of the saying "oh be a nice girl kiss me" you'd know that stars a classed not only by there size but also their temperature. (OBANGKM) or atleast something close too that. Stars that are younger burn much hotter than during the middle phases of there life cycle, so stars that are white, green and blue ( I should think) would be less likely to have habitable planets while stars that are more in the main squence such as yello
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