Day 105 – Star Size and Abundance

Screen shot 2014-02-18 at 11.47.43 AM

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.


Screen shot 2014-02-18 at 5.55.22 PM


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