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Originally Posted by Arneb
But still this question is about the late 20th, not 19th century. I think IMO wants us to find out how a respectable scientific opinion on the planetology of the two bodies was refuted by (which?) observation.
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Yes ... second half of 20th century. Hint: sketches of Mercury were involved as were observations of stellar occultations by Mars. The physical characteristics involved were very different in the two cases.