In a 1966 interview, Muhammad Ali bragged that he would journey to Mars and become heavyweight champ on the Red Planet as he had done on Earth. It was an idle boast, of course. Decades have passed, an...
d still no one has set foot on Mars. But for astronomy-minded folks, Ali's playful words raise an interesting question: if the boxer's fighting weight on Earth in 1966 was 213.5 pounds, what would it have been on Mars...and on other planets?
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