Hypersonic Missiles Are Unstoppable. And They’re Starting a New Global Arms Race. The new weapons — which could travel at more than 15 times the speed of sound with terrifying accuracy — threaten to change the nature of warfare. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Solar Storm in pictures: Huge solar storm to hit Earth TODAYStephen Hawking dead: What was he renowned for? Discoveries and findings listedStephen Hawking on aliens: We should keep quiet so ET doesn’t KILL USStephen Hawking dead aged 76: Extraordinary life and career in picturesStephen Hawking, in His Own WordsFull moon 2018: When is the next full moon? Full lunar calendar REVEALED