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WikiPedia: Sao chổi Shoemaker-Levy 9 http://midnightkite.com/sl9.html http://www.cfa.harvard.edu/iau/Ephemerides/Comets http://www.physics.sfasu.edu/astro/sl9/cometfaq.ht... http://apod.nasa.gov/apod/ap001105.html http://nssdc.gsfc.nasa.gov/planetary/comet.html http://www2.jpl.nasa.gov/sl9/sl9.html http://web.archive.org/web/19970812204925/http://w... http://web.archive.org/web/20120305030940/http://w... https://commons.wikimedia.org/wiki/Category:Comet_...