NASA insists it is going to Mars, but it really can't afford to

 作者:侴蔗蹿     |      日期:2017-08-05 05:26:22
David Howells/Corbis via Getty Images By Leah Crane NASA wants you to know it is on a Journey to Mars. For the last few years, the space agency has done everything it can to work those three words into press releases, public statements and YouTube videos. Nearly all of NASA’s current activities, it says, will culminate in landing humans on the Red Planet in the 2030s. But recently, NASA has admitted this journey is going nowhere fast. Last month, its chief of human space flight, William Gerstenmaier,