L7 Activity 021923
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University of Washington *
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150
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Geography
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Feb 20, 2024
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Giles Jackson ASTR 150 02/19/2023 L7 Activity L7 Activity: Giant Planet Satellites Question 1 (2 pts):
Name two surface features that Ganymede appears to have in common with the Moon. Both Ganymede and the moon’s surfaces are cratered, and they both have older and younger regions, evident by the dark and light areas respectively. Question 2 (2 pts)
. In what ways are these features similar? In what ways must the origins of the features on Ganymede be different? The craters are features that appear on both and of course they were caused by a collision of the satellite and some other particle. The features on Ganymede must be different because of its surface which is made up of rocky particles and water-ices. Whereas the moon’s surface consists of molten liquid iron. Question 3 (4 pts):
Which satellite(s) experienced resurfacing? Describe the evidence you see. The satellites that have experienced resurfacing are Dione and Enceladus. Enceladus particularly has a smooth surface indicated by the light that reflects from it. Although the moon has craters, its not as much as un comparison to Saturn’s moons. Question 4 (2 pts):
Are there areas of crater saturation on any of these four satellites? Which one(s) and on what part? The satellites Rhea and Mimas definitely have crater saturation, especially Mimas ore toward the middle or north part of the moon. The saturation is more obvious with the smaller craters. Question 5 (2 pts):
In general, are there certain regions of any of these satellites that allow one to assume the surface is younger or older compared to regions of Earth’s Moon? Explain your reasoning. We should assume the surface of Enceladus is younger due to the resurfacing which makes it smoother looking. Question 6 (2 pts): The images above are from two different worlds. The image at left shows a lake (at different resolutions) located in the polar region on Titan, while the image at right shows Lake Superior on Earth. List a few things that look very similar and a few that are quite different between the two lakes. The similarities in the two lakes: blotch shaped, both have majority darker blue areas with some lighter blue, both have smaller lake regions near, both surrounded by gold tone land color. The differences in the two lakes: liquid ethane and methane on Titan and water in Lake Superior, the surrounding area of the lakes on Titan are lighter may be due to erosion (unsure), Titan’s Lake appears to be larger, but I couldn’t verify this.
Giles Jackson ASTR 150 02/19/2023 L7 Activity Question 7 (2 pts):
The northern and southern hemispheres of Triton are clearly different. Describe the two different regions of Triton using the vocabulary and terms you have learned to describe the surfaces of other worlds. The Northern hemisphere of Triton appears to have smoother volcanic plains, mounds and round pits which were formed by the icy lava flows (from ice volcanoes). Whereas the Southern hemisphere is covered by a highly reflective cap of frozen nitrogen and methane sprinkled by impact craters and openings of geysers. Question 8 (1 pts):
What is the evidence do you see on the surface that indicates Triton’s surface has been reprocessed or modified? The ridges and valleys of the surface would more than likely be from the geological activity (tectonic processes). Also, because there seems to be no large impact craters visible, it’s probably been renewed in the past billion years or less. Question 9 (2 pts): What region(s) on our Moon (or other worlds) do you think are similar in origin to this plain? I would say that our Moon once had active volcanoes of basaltic lava which of course are now dormant. Question 10 (1 pts):
What is one major difference between the formation of this plain and those similar features on the Moon? The big difference between the formation of this plan versus the moon is the surface material. Triton’s plains are a result of icy lava whereas the Moon’s plains are basaltic lava.
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