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Regulus is main sequence, not a blue giant.

[edit] Article Structure

Pertaining to article as it appeared on 14 September 2006, particularly the second paragraph, it defines too many newly introduced terms (to the article) in the context of other newly introduced terms. The result to the uninitiated is an inconclusive understanding of what any of the terms mean, even relative to one another. I would be eager to see this treatment discussed with a greater supporting structure of fully disclosed meanings.

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I would appreciate if someone could start the article off in a more layman-friendly way since I certainly do not even havae a clue what class O-B means and it would be nice not to have to know this to start reading the article.