Different methods used to measure distances.
Figures from Open University's text "Galaxies and Cosmology" (top) and from Seeds (bottom).
The Distance Ladder |
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Different methods used to measure distances.
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| Methods "higher" in the diagram rely on calibrations from methods "lower" in the diagram. Hence the term "distance ladder" to evoke climbing from lower rungs to higher ones. | |
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Figures from Open University's text "Galaxies and Cosmology" (top) and from Seeds (bottom). | |