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The Distance Ladder

The Distance Ladder. Part II. Number of stars=N star *V Sphere: V=4?R 3 /3 Cylinder: V=?R 2 H. R. R. H. (a). (b). Cepheid Variable Stars (part III, IV). Special type of variable star that brightens & dims with a regular period P~L, recall F=L/4?d 2 , known P, F, derive d.

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The Distance Ladder