Why THIS could be a ‘SHOWSTOPPER’ for Elon Musk's hopes of colonising Mars THE huge amounts of radiation which people will be exposed on the way could prove a “showstopper” for hopes of successfully colonising Mars, an expert has warned. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Are these the GREATEST words ever written about planet Earth?New Jersey Seeks Stricter Limit on Chemical in Drinking WaterScott Pruitt, E.P.A. Chief, Says Agency Scientists Are Free to Discuss Their WorkTrilobites: What Happens When You Microwave a Boiled EggNASA to send probe to asteroid worth £8,000 QUADRILLION which could DESTROY global economyBronze Age weapons had ALIEN origin, astonishing study finds