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On the hunt for other solar systems, scientists have discovered an Earth-sized planet orbiting the star nearest to our Sun, Proxima Centauri. It's an important test of whether we are alone in the universe. Stephen Hawking and othe...

Among the last unclimbed peaks on earth there stands a little-known mountain in a remote region of China. TO BE FIRST: THE QUEST FOR YANGMOLONG follows a climbing expedition as they make three attempts over the span of three years...