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Before proceeding to cover topics in depth (other than pet topics that people cannot be stopped from covering immediately) let's make certain that all basic terms are covered. I am aware that "Wikipedia is not a dictionary", but I think that many basic concepts (e.g. precession?, [obliquity of the ecliptic]?) to give two right off the top of my head) need to be present in order for the work to stand on its own. Maybe we can make a list on this page of requested articles.
Lists of things: We need to set up some formats, for instance, each planet will have its radius, density etc. in a common format, and will have a description of its composition, and then cover unique features of the planet.
Big, long tables of objects: Do we want big long tables? I am not sure this is useful, should there be big long tables in an encyclopedia (Look at the entry for Star)? I am not sure how valuable this is. If I want to look up Bellatrix?, am I going to look up Star and then click on Bellatrix?? If I look up Star, do I want to see a long list of names, with no additional information?