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By Newton Friend J.

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This is an illustration of the principle of superposition: the shape of an impact crater is added to the shape of the target surface. If the target surface is sloped, the crater will be slanted accordingly.

They are likely to have been caused by a pair of primary impactors. 43 km estimated rim passes to the east of the center of these craters. This difference between wall heights is typical of craters that span basin rims, such as we will see in Tsiolkovskiy and also in Apollo, which span the rim of the South Pole-Aitken Basin. The Western 41 Far Side Region LO1-136H3 Sun Elevation: ~20° Shirakatsi (S, 51 km) and Dobrovol’skiy (D, 38 km) are of similar age, as indicated by their degree of degrada- Distance: ~1520 km tion, but clearly Shirakatsi is the later impact since it has plowed the rim of Dobrovol’skiy onto its floor.

57 km Pre-Nectarian Freundlich-Sharanov Basin, 600 km Heaviside, 165 km Keeler-Heaviside Basin, 780 km Ventris, 95 km Key: The Western 29 Far Side Region The trough northeast of Ventris (also visible in LO1-116M) is radial to Gagarin. Striations across the upper half of this photo, running between the upper left corner and Krasovskiy, Lipskiy, and Daedalus, come partly from the Moscoviense Basin and partly from the Korolev Basin (beyond Icarus to the southeast). The dark area around Dewar, north of Keeler and Heaviside, is both low in albedo and depressed in elevation.

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Man and the chemical elements. by Newton Friend J.

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