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Moon |
 | | Its crust averages 68 km thick, is thinner on the near side, and varies from essentially zero thickness under Mare Crisium to a depth of 107 km north of the crater Korolev on the lunar farside. |
 | | Mass concentrations, or mascons, associated with the circular maria, and thought to be caused by layers of denser, basaltic lava, were discovered as a result of their gravitational effect on the orbital motions of Lunar Orbiter probes in the 1960s. |
 | | The largest crater on the nearside of the Moon with a diameter of 295 km and maximum depth of 3.96 km. |
| www.daviddarling.info /encyclopedia/M/Moon.html (1480 words) |
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