Week 8 DQ's

Week 8 DQ's - during the formation of stars. Starburst...

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Discussion Questions (Due on Saturday): 1) What is the difference between Population I and Population II stars? Where are they located in our galaxy? A Population I star is rich in atoms heavier than helium; nearly always a relatively young star found in the disk of the galaxy. A Population II star is poor in atoms heavier than helium; nearly always a relatively old star found in the halo, globular cluster, or the nuclear. 2) Pick a galaxy (besides the Milky Way) and state some information about that galaxy. Include a picture of the galaxy with your post. Starburst galaxy – is a bright blue galaxy in which many new stars are forming, thought to be caused by collisions between galaxies. Starburst galaxies are galaxies that are in the process of creating massive formations of stars. This type of galaxy emits large amounts of infrared light created by the explosions that happen
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Unformatted text preview: during the formation of stars. Starburst galaxies were first identified by this incredible amount of infrared light. Infrared light is the portion of the electromagnetic spectrum with wavelengths slightly longer than optical light that takes the form of heat. 3) Light moves at a finite speed. Why is this fact important when observing galaxies? There are two reasons, one is a light year equals the distance light travels over the period of a year. This is roughly equal to 5,865,696,000,000 miles. If you are viewing a galaxy that is one light year away, you are seeing it as it was one year ago, two light years, two years ago, and so on. The second reason is it helps to determine how far away the galaxy is....
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This note was uploaded on 01/17/2010 for the course PHY 110 taught by Professor Smith during the Spring '09 term at Upper Iowa.

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