MOUNTAIN VIEW, Calif. — NASA's planet-hunting Kepler spacecraft has confirmed the discovery of its first alien world in its host star's habitable zone — that just-right range of distances that could allow liquid water to exist — and found more .
The Dropa Stones were first discovered in 1938, when a archaeological expedition led by Chi Pu Tei, stumbled across a cave high in the mountains that border China and Tibet
It was obvious to the archaeologists that the cave had been .
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