Earth Sciences 1086F/G Lecture Notes - Lecture 8: Late Heavy Bombardment, Dynamo Theory, Zond 5
13 Oct 2017
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They were too fluid to build peaks; there are small domes from lava below the surface and long channels called rilles near the edges of maria. The meteor impacts formed sinuous rille: the far side has barely any maria and many craters. 3. 0 craters to learn by: meteoroid: sand 100 m, asteroid: 100 m 1000 km. If we could estimate the rate of crater production, we could calculate a relative age. 2: current impacts to the moon are rare; objects that are 10s of meters hit the moon every. 3. 1 crater making 101: due to orbital speed and planetary gravity, impacts occur at 10 + km/s , smaller meteoroids can be destroyed in atmospheres (like earth) or slowed so they don"t make craters. Imbrian period (3. 16 3. 64) flood basalts, orientale basin, imbrian basin. 3: nectarian period (3. 65-3. 92) nectairs basin, pre-nectarian period (4 +) basins, intense bombardment, formation of moon.
