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(Solved): Based on their spectral class rank the following stars from coldest to hottest surface temperatures ...
Based on their spectral class rank the following stars from coldest to hottest surface temperatures. Use 1 as the coldest and 7 as the hottest. I suggest writing all the spectral classes down on a piece of paper, and then ranking them. G7 Star A4 Star B9 Star O3 Star M2 Star G2 Star A1 Star