Two Grand Canyon-size valleys on the far side of the moon formed within 10 minutes, scientists say
By Ashley Strickland, CNN (CNN) — About 3.8 billion years ago, two massive canyons likely formed on the moon in a span of less than 10 minutes, according to new research. The extraordinary formations, each comparable in size to Earth’s Grand Canyon, are hidden on the far side of the moon — the side that
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