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The moon's past was livelier and more complex than scientists had thought, new results from China's first lunar rover suggest.China's Yutu moon rover found evidence of at least nine distinct rock layers deep beneath its wheels, indicating that the area has been surprisingly geologically active over the past 3.3 billion years."Two things are most interesting," said Long Xiao, a researcher at the China University of Geosciences in Wuhan, who is the lead author of the study detailing the new findings. "One is [that] more volcanic events have been defined in the late volcanism history of the moon," Xiao told Space.com via email.