: Answer each question with five complete sentences . 11. [20 pts] Describe what evidence exists that there was liquid water on the surface of in the past what happened

: Answer each question with five complete sentences . 11. [20 pts] Describe what evidence exists that there was liquid water on the surface of in the past what happened to that water. 12. [20 pts] Describe two major observational methods for detecting ? For each method explain what planetary properties can be measured from each method. 13. [20 pts] is tidal heating? Describe what evidence exists that there is on and discuss the type of habitable conditions that would be present life did exist on this moon. 14. [20 pts] A common theme in science fiction is to find a new planet for humans to live on. Now that we know about thousands of exoplanets, we can start imagining how to choose one. Describe the characteristics that we would look for in a planetary system that would make for a good home for humans. [nt: think about life’s prerequisites and planetary system properties.] 15. [20 pts] Make your own estimate of the . explain your reasoning about the values selected for of the variables of the Drake Equation. Does your estimate of match your view of the probability of Life and Civilizations in the Universe? ? Purchase the answer to view it

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