Homework 8 handout - HW8 Due Thursday April 17 If words are required in an answer then the answer should be expressed in a complete sentence If a number

# Homework 8 handout - HW8 Due Thursday April 17 If words are...

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HW8: Due Thursday April 17 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. How would you classify the following galaxies displayed in the hallways of Van Vleck Observatory, using the system illustrated in Figure 20.8? Justify your answers with a sentence or two. a) The galaxy displayed by the bulletin board of Prof. Moran’s office (105). b) The average galaxy in the cluster of galaxies displayed just to the left of the department office across from the VVO library. c–d) Both galaxies in the interacting pair displayed in the first picture across from the bulletin board of Prof. Hughes’ office (109). e–f) In the image just to the left of the interacting pair of galaxies, many galaxies are visible, with a handful of large galaxies sprinkled across the image. Classify the large galaxy in the top left and the large galaxy in the bottom left. 2. The disk of the Galaxy is about 100,000 light-years in diameter and 1,000 light-years thick. a) Find the volume of the disk in cubic light-years. b) Find the volume (in cubic light-years) of a sphere 100 light-years in radius centered on the Sun. c) If supernovae occur randomly throughout the volume of the Galaxy, what is the probability that a given supernova will occur within 100 light-years of the Sun?

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