Comment on Elon Musk’s SpaceX can’t afford to send humans to Mars, according to Neil deGrasse Tyson

This article originally appeared on the Motley Fool. A Harvard graduate, with a doctorate from Columbia and a post-doc from Princeton, Hayden Planetarium director Neil deGrasse Tyson is a certified smart guy. So when I heard Dr. Tyson had a new book coming out, Astrophysics for People in a Hurry, I ...