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The 66 pages that link to Cosmic distance ladder, each with the reason it gives.

• Type Ia supernovaRelated: Type Ia supernovae extend distance measurements far beyond many direct geometric methods.

• AstrometryRelated: Parallax calibrates nearby stars that anchor several farther-reaching distance methods.

• SupernovaRelated: Supernovae extend distance measurements far beyond the reach of parallax.

• Big BangRelated: Reliable galaxy distances help calibrate the expansion rate central to Big Bang cosmology.

• Cosmological redshiftRelated: Redshift-distance comparisons help calibrate and test the ladder at cosmic scales.

• CosmologyRelated: Distance estimates connect observed galaxy redshifts to the expansion rate.

• Hubble tensionRelated: Its calibration underlies prominent local measurements that exceed the early-universe prediction.

• Observable universeRelated: Its measurements anchor estimates of the observable universe’s size and expansion.

• Hubble's lawRelated: Distance measurements supply the other half of the law’s velocity–distance relation.

• Harvard ComputersRelated: The period–luminosity relation found from Harvard data became one of its foundational rungs.

• PolarisRelated: Polaris’s distance affects the calibration of Cepheid luminosities used farther across the universe.

• ParsecRelated: Parallax measurements anchor the ladder’s direct stellar-distance rung.

• Scale factorRelated: Distance measurements combined with redshift constrain how the scale factor has changed.

• Light-yearRelated: Light-years express results from distance measurements across the ladder’s many scales.

• Edward Charles PickeringRelated: Harvard’s variable-star research under Pickering helped establish methods later used to calibrate cosmic distances.

• Age of the universeRelated: Its local expansion measurements contribute to age estimates and the Hubble tension.

• Eclipsing binaryRelated: Certain eclipsing binaries provide calibrated luminosities and distances to nearby galaxies.

• Hubble parameterRelated: Its nearby-galaxy measurements help determine the present-day expansion rate.

• Hubble flowRelated: Reliable distances are needed to test the relation between galaxy distance and recession.

• Magellanic CloudsRelated: Variable stars in the Clouds anchor key steps in this chain of measurements.

• Astronomical observationRelated: Linked distance estimates turn observations into a map of cosmic scale.

• Walter BaadeRelated: Baade’s revised Cepheid calibration changed a key rung and doubled the estimated distances to galaxies.

• Cosmic flowRelated: Independent distances are needed to compare observed recession speeds with expansion predictions.

• Cosmological parametersRelated: It supplies local distance-based estimates of the Hubble constant.

• Lookback timeRelated: Distance estimates help place sources whose light-travel times are then inferred from cosmology.

• Palomar ObservatoryRelated: Palomar observations helped calibrate distances to galaxies and refine estimates of cosmic expansion.

• Messier 51Related: Distance estimates for Messier 51 help anchor studies of its size and luminosity.

• Type II CepheidRelated: Period–luminosity measurements let Type II Cepheids contribute to distance estimates.

• 3C 273Related: The distance to 3C 273 connects quasar observations to the cosmic distance scale.

• Abell 1689Related: Lensed sources behind the cluster provide information about cosmological distance ratios.

• Universe (cosmology)Related: Distance measurements underpin estimates of cosmic expansion and the universe’s scale.

• Allan SandageRelated: Sandage calibrated successive distance indicators to estimate distances to remote galaxies.

• Extragalactic astronomyRelated: Distance estimates turn observed galaxy brightness and redshift into physical scales.

• Kepler's SupernovaRelated: Type Ia supernovae like Kepler’s help calibrate a major rung of this distance-measurement system.

• Physical cosmologyRelated: Its measurements anchor estimates of the expansion rate and the Hubble constant.

• Pinwheel GalaxyRelated: Distance estimates to Messier 101 connect stellar measurements to larger-scale methods.

• Andromeda–Milky Way collisionRelated: Distance uncertainties affect inferred galaxy masses and the interpretation of their relative motion.

• Chronology of the universeRelated: Distance measurements help reconstruct expansion and place observations in cosmic time.

• Expansion of the UniverseRelated: It anchors nearby distance measurements used to infer the local expansion rate.

• NGC 6946Related: Independent distance indicators constrain how far NGC 6946 lies from the Milky Way.

• Observational cosmologyRelated: It links nearby measurements to distances used in studies of cosmic expansion.

• Intergalactic dustRelated: Unrecognized dust dimming can propagate into errors in calibrated cosmic distances.

• Recessional velocityRelated: Its distance estimates combine with redshifts to determine recession rates and expansion.

• South Pole WallRelated: Distance estimates help place the wall’s galaxies in three dimensions.

• Timeline of cosmological theoriesRelated: Distance estimates let astronomers relate galaxy recession to cosmic scale and expansion.

• Yellow supergiantRelated: Cepheid yellow supergiants provide calibrated distances to nearby galaxies.