UMD ASTR 100 - Homework #3 (2 pages)

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Homework #3



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Homework #3

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Pages:
2
School:
University of Maryland, College Park
Course:
Astr 100 - Introduction to Astronomy

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Homework 3 DQ 1 If liquid water is rare on the surface of the planets then most terrestrial planets must have carbon dioxide rich atmosphere why Liquid water on the planet s surface is required for the removal of atmospheric carbon dioxide Silicate rock is transformed into carbonate rock trapping carbon dioxide Temperature on a planet s surface determines whether or not water can exist as a liquid and most terrestrial planets are either too hot or too cold Describe the surfaces of Jupiter s moons Io Europa Why are they different from the surface of the Earth s moon Jupiter s moons Io Europa are rocky worlds with densities similar to earth s moon Io s surface has no impact caters and many of active volcanoes while Europa is mostly rock with a thin icy crust and a watery fluid mantle Europa s surface contains very few craters and has long scars suggesting cracks where liquid has flowed up through the ice crust On the other hand Earth s Moon has a rocky crust covered with impact craters Earth s moon has no watery mantle or active volcanoes as compared to the Jupiter s moons The moon has lost internal heat and lacks a watery mantle The Moon has no current geological activity such as volcanoes to cover craters either With no atmosphere erosion cannot erase craters Due to the tidal forces from Jupiter Io Europa are warm inside Io s volcanoes throw out material that covers craters Europa s crust slips slides fractures releasing water and destroying impact craters Describe Pluto Describe a typical Kupier Belt Object How would you classify Pluto as a planet or Kupier Belt Object Support your answer Kupier Belt Objects are small icy planetesimals that lie beyond the orbit of Neptune 30AU out to 50AU from the Sun Pluto is the outermost planet with semi major axis equal to 39 5 AU Pluto s low density 2 g cm3 indicates a considerable ice component due to its temperature 382 F Pluto is the smallest planet 0 19 Earth s radius and has the lowest mass 0 002 Earth s mass When Pluto



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