the cosmic distance ladder - pennsylvania state university · 2005. 7. 14. · the cosmic distance...
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The Cosmic Distance LadderThe Cosmic Distance Ladder
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Distance Measurements via ParallaxDistance Measurements via Parallax
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Hipparcos Satellite Before LaunchHipparcos Satellite Before Launch
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GAIA GAIA –– A Planned Future MissionA Planned Future Mission
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Estimating the Distance to Estimating the Distance to a Stop Lighta Stop Light
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Cepheid Variable StarsCepheid Variable Stars
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The PeriodThe Period--Luminosity Relation for Luminosity Relation for Cepheid Variable StarsCepheid Variable Stars
Henrietta Leavitt
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HST Observations of Cepheid HST Observations of Cepheid Variable Stars in M100 at ~ 20 MpcVariable Stars in M100 at ~ 20 Mpc
HST key project measured Cepheid distances to ~ 25 galaxies within 25 Mpc.
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Distances from Type 1a SupernovaeDistances from Type 1a Supernovae
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Mass Discovery of Type 1a SupernovaeMass Discovery of Type 1a Supernovae
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Light Curves of Type 1a Light Curves of Type 1a SupernovaeSupernovae
Peak luminosity and subsequent fading are related.
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SNAP SNAP –– A Planned Mission toA Planned Mission toMeasure Distances to Type 1a Measure Distances to Type 1a
SupernovaeSupernovae