Day 105 – Star Size and Abundance

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Whew. Finally back after two snow days and then a 3 day weekend and a 2 hour delay today! We are on to the HR diagram today and a quick discussion of relative abundance of stars. The above diagram is one of my favorites. Always interesting to talk about how big a million cubic parsecs would be. The question of the week on xkcd is about stars and grains of sand but with a twist worth thinking about! Click on image below.

 

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Day 18: Interactive HR Diagram

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Students in astronomy are using this interactive site from the U of Nebraska-Lincoln to better understand the HR diagram. The site is on the class Moodle so they can came back to it easily. There are a number of good astronomy apps at this web site.