I'm doing an informal astronomy lecture on Thursday, "The Deaths of Stars", talking about supernova, black holes, neutron stars etc.. I't sbeen awhile, and I find I have to do a bit of homework beforehand to remember some of the details after 20 years, e.g. is the Chandrasekar Limit 1.38M or 1.44M? (It turns out, it depends on the chemical structure of the star, but the metalicity effects the number of electrons available for supporting the star by electron degeneracy pressure).
It's a lot of fun, but I am starting to think I might need to go teach at the community collegefor a bit and work the rust out of my lectures.
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