A former astronaut aims to create a rocket engine that would allow speedy travel to Mars - The Washington Post
▻http://www.washingtonpost.com/national/health-science/a-former-astronaut-aims-to-create-a-rocket-engine-that-would-allow-speedy-travel-to-mars/2014/04/14/00e56340-bffe-11e3-bcec-b71ee10e9bc3_story.html