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http://addons.mozilla.org/?application=firefox
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http://neo.jpl.nasa.gov/neo/close.html
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http://www.harmsy.freeuk.com/orrery.html
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http://antwrp.gsfc.nasa.gov/apod/astropix.html
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http://www.heavens-above.com/logon.asp
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http://observers.org/beginner/glossary.html
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http://www.weasner.com/etx/buyer-newuser-tips/starcharts.html
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http://bigcharts.marketwatch.com/historical/default.asp
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