unitthreeassignment3.docx

unitthreeassignment3.docx - AST 1002 Horizons in Astronomy...

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AST 1002 Horizons in Astronomy Unit Three Book Assignment 1. Astropedia 6.2: In terms of a percentage of Earth’s size how big are Mercury Venus and Mars? How would you expect their gravities to compare? What has their size got to do with whether they are geologically active? Mercury is 38.3%, Venus is 94.9%, and Mars is 53.2% Planets size is not a given factor for geologic activity, a planet can be very large but have a very small mass, the factors that really play a role on geological activity are core heat, volcanic activity and tectonic plates movement. 2. Astropedia 6.5: What do numbers of impact craters tell us about the relative ages of the surfaces of Mercury Venus Earth and Mars? List these four in order of increasing average surface age. Craters help Scientists determine the history and age of a planet. In the early times when the solar system was forming, there was a lot of debris that were impacting planets and moons. By analyzing a recording data about the craters, we can learn if the surface is old or young, and how geologically active it is. Mercury Mars Venus Earth 3. Astropedia 6.9: Describe in what ways Mars is of special interest in terms of the Copernican revolution and for establishing whether Earth is unique in the universe or only one planet among many that might have terrestrial climates life or even intelligent life. What does Mars show us about the existence of liquid water on other planets? What does it tell us about the probability
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