The Cosmic Distance Ladder

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The Cosmic Distance Ladder
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Distance Measurements via Parallax
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Hipparcos Satellite Before Launch
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GAIA A Planned Future Mission
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Estimating the Distance to a Stop Light
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Cepheid Variable Stars
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The Period-Luminosity Relation for Cepheid
Variable Stars
Henrietta Leavitt
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HST Observations of Cepheid Variable 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 Supernovae
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Mass Discovery of Type 1a Supernovae
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Light Curves of Type 1a Supernovae
Peak luminosity and subsequent fading are related.
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SNAP A Planned Mission toMeasure Distances to
Type 1a Supernovae