Even a 90mm ETX will show that craters and maria aren't all there is to see on the Moon. Systems of rilles, cracks in the lunar surface, are visible in many locations, sometimes stretching for hundreds of miles and forming intricate networks. There are also valleys, like the magnificent and imposing Alpine Valley near Plato, and scarps, places where the lunar surface has been elevated in linear fashion, forming great cliffs. The Straight Wall scarp, visible in an ETX or C5 with ease as a razor-thin black line, is one of the first lunar attractions the new CAT owner should visit. Less obvious are lunar domes, gentle swellings of the surface. These strange features may have been created by volcanic activity and are almost impossible to detect except under the lowest Sun angles.
There's a spot on the Moon where many of these interesting sights are all jumbled together: Aristarchus. This 40-km-diameter crater is strangely bright against the darker surface around it and is abutted by a long, sinuous rille and numerous domes that can be seen when the Sun is rising or setting (Plate 50).
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