Homework Handout 6 - HW6 Due Thursday March 27 If words are required in an answer then the answer should be expressed in a complete sentence If a number

Homework Handout 6 - HW6 Due Thursday March 27 If words are...

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HW6: Due Thursday March 27 If words are required in an answer, then the answer should be expressed in a complete sentence. If a number is required in an answer, then the number should have the correct number of significant figures, and should include units. If you are asked a multiple choice question, you are required to indicate all correct answers (and there may be more than one). Remember to show all work, and be legible and clear. Your homework should be returned on a separate piece of paper. 1. The interior of a dark molecular cloud is billions of times less dense than the air that you breathe. How, then, are molecular clouds able to block out starlight? ( Hint: It may be helpful to think of an analogy: What properties of a fog bank would cause it to completely block our view of distant mountains? ) 2. Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ? A) location where they are formed B) time they are formed C) luminosity they are formed with D) mass they are formed with E) color they are formed with 3. Our perspective of the universe is unique in part because of the interstellar medium. a) Describe how our view of the night sky would be different if there were no dust grains in the interstellar medium. b) Describe how our view of the night sky would be different if the solar system was surrounded by a dense molecular cloud.
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