Mark is an award-winning journalist and the science editor at Mashable. After working as a ranger with the National Park Service, he started a reporting career after seeing the extraordinary value ...

Elon Musk wants to send humans to Mars to establish the first Martian cities. But Mars is big. It's a planet, after all. So where should we put the first cities? The North or South poles?

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. María Rosa Pino Otín is a Professor and ...