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The Discovery Of Cepheid Variables And The Period-Luminosity Relation Exercise- Determine The Distance To NGC 7331 DISCOVERY & THE PL LAW DISTANCE TO NGC 7331 ------------------------------------ THE H-R DIAGRAM TYPES OF CEPHEID OUR GALAXY,LMC,SMC DETERMINE THE CEPHEID ------------------------------------ PHYSICS OF CEPHEIDS THE K-MECHANISM RADIUS OF CEPHEIDS RADIUS OF ETA AQUILAE ------------------------------------ CEPHEIDS FOR AMATEURS OBSERVING DELTA CEPHEI OBSERVING ETA AQUILAE   ENTER THE AVERAGE APPARENT MAGNITUDE: ENTER THE CORRECTED ABSOLUTE MAGNITUDE: THIS IS THE DISTANCE TO THE GALAXY IN PARSECS O.K. now go onto the next section by clicking on the link at the top of the page.

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