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| | The Moon |
 | | Those moons display "palimpsest" craters which are merely surface markings, because as time passed, the walls which originally existed sagged back onto the flat surface. |
 | | By the laws of motion, the Moon orbits not the center of the Earth, but the center of gravity of the Earth and Moon (this will be discussed in section #11a, and the center of gravity is defined in section #25). |
 | | Of these, Luna 3 rounded the Moon, took photographs of the far side which is not seen from Earth, and later scanned and transmitted those images (on the right); unfortunately, their quality was poor. |
| www-spof.gsfc.nasa.gov /stargaze/Smoon2.htm (2100 words) |
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