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Directory Listings Classifying Galaxies Offers an interactive lesson on the Hubble System of classifying galaxies. http://www.smv.org/hastings/galaxy.htm - profile Galaxies Essay on these large systems of stars and interstellar matter, typically containing several million to some trillion stars, of masses between several million and several trillion times that of our Sun, of an extension of a few thousands to several 100,000s light years, typically separated by millions of light years distance. http://www.seds.org/messier/galaxy.html - profile |
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