Three robotic probes are returning a wealth of data on impact craters for scientists, who are studying the craters in the same way that biologists study tree rings – for clues to the history of the objects they’re investigating. This month Messenger completed its yearlong primary mission orbiting Mercury. It was a productive year, generating 57 papers for the 43rd Lunar and Planetary Science Conference near Houston and two more online in Science Express. But as is often the case with new ...


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