Elon Musk’s bombshell decision to freeze plans to begin building a human colony on Mars, in favor of fostering a Moon city, is a cosmic mistake, says a top Mars scholar.

Last week I asked what you thought about Elon Musk's pivot away from Mars to concentrate more on establishibng a city on the moon. I had to chuckle when I read the results. More than 60% of readers responded by checking the "Don't care" box. I'm going to ...