In this May 2, 2016 photo, researchers watch a six-foot-tall, 300-pound Valkyrie robot walk slowly at University of Massachusetts-Lowell's robotics center in Lowell, Mass. “Val”, one of four sister robots built by NASA, could be the vanguard for the colonization of Mars by helping to set up a habitat for future human explorers. NASA spokesman Jay Bolden says the agency aims to get to Mars by 2035 and it�ll be the Valkyries or their descendants paving the way. (Photo by Elise Amendola/AP Photo)
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