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Subject: Introduction *sci.astro* is a newsgroup devoted to the discussion of the science of astronomy. As such its content ranges from the Earth to the farthest reaches of the Universe. However, certain questions tend to appear fairly regularly. This document attempts to summarize answers to these questions. This document is posted on the first and third Wednesdays of each month to the newsgroup *sci.astro*. It is available via _anonymous ftp_, <URL:ftp://rtfm.mit.edu/pub/usenet/news.answers/astronomy/faq>, and it is on the World Wide Web at the _sci.astro FAQ site_, <URL:http://sciastro.astronomy.net/sci.astro.html>, and _Internet FAQ Archives_, <URL:http://www.faqs.org/faqs/astronomy/faq/>. A partial list of worldwide _mirrors_, <URL:http://sciastro.astronomy.net/mirrors.html>, (both ftp and Web) is also available. (As a general note, many other FAQs are also available from _rtfm.mit.edu_, <URL:ftp://rtfm.mit.edu/pub/usenet/news.answers/>.) Questions/comments/flames should be directed to the FAQ maintainer, Joseph Lazio <firstname.lastname@example.org>.