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"No one has ever produced a statement of fact that was technically true. The most accurate statements of science we have today are accurate to only 15 decimal places."
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The Moon is geologically (selenologically!) active; instruments left by the Apollo astronauts from 1969 to 1972 demonstrate that from 600-3000 quakes occur per year. Shallow moonquakes (only 20-30 kilometers below the surface) have energy equivalent to Richter 5.5 quakes on Earth, and can last for ten minutes or more.
Has anyone thought about this problem? Fortunately, we have Heinlein.
Heinlein also identifies tidal stress as the cause of moonquakes:
"Come again," I said. "There isn't any water on the Moon. How can there be tides?"
"You don't have to have water to have tidal stresses. Don't worry about it; just accept it. What you get is unbalanced stresses. They can cause quakes."
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