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WASHINGTON—Marking the first time in history that humans have successfully smoothed away all the unsightly craters of a celestial body, NASA announced Thursday that it had polished the moon using an orbital rock tumbler. “Thanks to the…

Researchers have confirmed the existence of a distinct structure inside our planet’s inner core, saying the newly discovered “innermost inner core” is a solid ball of iron and nickel about 800 miles wide that could help inform the evolution…