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According to the new study, the 12 Apollo astronauts who walked on the moon between 1969 and 1972 kicked aside so much dust that they revealed huge regions of darker, more heat-absorbing soil that may not have seen the light of day in billions of years. Over just six years, this newly exposed soil absorbed enough solar radiation to raise the temperature of the entire moon's surface by up to 3.6 degrees F (2 degrees C), the study found.
"In other words," Kiefer said, "the astronauts walking on the moon changed the structure of the regolith."
On this day in history in 1969, the first humans set foot on the Moon during #Apollo11. With more than half a billion people watching on television, Neil Armstrong and Buzz Aldrin went where no one had gone before.