The Cosmic Distance Ladder

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Presentation transcript:

The Cosmic Distance Ladder

Distance Measurements via Parallax

Hipparcos Satellite Before Launch

GAIA – A Planned Future Mission

Estimating the Distance to a Stop Light

Cepheid Variable Stars

The Period-Luminosity Relation for Cepheid Variable Stars Henrietta Leavitt

HST Observations of Cepheid Variable Stars in M100 at ~ 20 Mpc HST key project measured Cepheid distances to ~ 25 galaxies within 25 Mpc.

Distances from Type 1a Supernovae

Mass Discovery of Type 1a Supernovae

Light Curves of Type 1a Supernovae Peak luminosity and subsequent fading are related.

SNAP – A Planned Mission to Measure Distances to Type 1a Supernovae

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