NASA's New Horizons spacecraft is sending back reams of data after its close Pluto flyby on Tuesday, including new details on what comprises its surface and atmosphere.Scientists on Friday released a simulated flyover of Pluto's 11,000-foot-tall mountain range called the "Norgay Montes," which are named after Tenzing Norgay, one of the first two humans to reach the summit of Mount Everest. Norgay was Sir Edmund Hillary's Nepalese Sherpa when he made his record-breaking ascent of the mountain in 1953.