Tech Insider/Recode/NASA Early Friday morning, Elon Musk tweeted, "Nuke Mars!" He then said "T-shirt soon," implying one of his various companies might make and sell "Nuke Mars" T-shirts. Musk has discussed the idea of terraforming Mars for years now, which could make it into an inhabitable planet. Visit Business Insider’s homepage for more stories. Elon […]