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How an ancient asteroid strike carved out 2 grand canyons on the moon

CAPE CANAVERAL, Florida — New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons on the lunar far side.

That's good news for scientists and NASA, which is looking to land astronauts at the south pole on the near, Earth-facing side untouched by that impact and containing older rocks in original condition.