What scientific questions can be answered? What does a circle around a crater tell a scientist?
A. Circling a crater tells us that there s a crater of a certain size at a certain location. Assigning a crater to a class based on its shape (morphology) tells us even more. The statistics gathered from that have been used to answer many questions about Mars (and other planets with solid surfaces, and moons). Here are some examples of questions already partially answered about Mars:How long has the Martian surface remained unchanged, compared to Earth and other planets and moons?By assuming that meteor impacts that cause craters happen at a constant rate but are then eroded away, we can estimate how much resurfacing a world has. Earth s craters disappear quickly (in thousands or millions of years, whereas its moon, now that its volcanoes are gone, has nothing to erode craters except for smaller meteors. The data from Viking Orbiter data suggests that some Mars surfaces hardly change over billions of years, much longer than on stormy Earth, icy Europa, or volcanic Io. New MGS data show
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