Neil deGrasse Tyson isn't riding SpaceX to Mars until Elon Musk answers this challenge

Neil deGrasse Tyson, the ever-witty astrophysicist who delivers the truth about space and science to the masses, held a Reddit AMA on Sunday, and it included a playful challenge to SpaceX founder Elon Musk. 
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When asked about SpaceX's recent Falcon 9 mission and whether he'd ever consider making a trip to Mars via SpaceX, Tyson kept it far realer than many might have expected. 
"I really like Earth. So any space trip I take, I'm