I consider myself a very small-scale contributor to the Wikipedia. I created my own account due to an IP-block against my ISP preventing access. At this stage I'm little more than a hedge-clipper, ironing out minor flaws in articles, with only a few exceptions where I've made more substantial contributions.
Stellar structure, evolution and pulsation
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If I ever have the time, I'd love to overhaul a number of articles related to the theory, observation and study of stars and their stellar oscillations. There are several related articles in Wikipedia already. Here are links to my (mostly non-existent) working copies, as well as the original articles (where appropriate).
