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Date: 2005-11-30 10:57:00Nuclear physics Baryons Matter Proton Neutron Down quark Up quark Atomic nucleus Electron Physics Particle physics Quarks | Microsoft Word - TracingOriginsSH.docAdd to Reading ListSource URL: genesismission.jpl.nasa.govDownload Document from Source WebsiteFile Size: 151,82 KBShare Document on Facebook |