WASHINGTON, DC - NOVEMBER 05:  Michael Meyer (L), Lead Scientist for NASA's Mars Exploration Program discusses recent findings by the MAVEN mission at NASA headquarters November 5, 2015 in Washington, DC. During a one year period that NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft has been investigating Mars, evidence was found of solar flares stripping away atoms in the planet's atmosphere.  (Photo by Win McNamee/Getty Images)