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The Cosmic Distance Ladder

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.

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The Cosmic Distance Ladder

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  1. The Cosmic Distance Ladder

  2. Distance Measurements via Parallax

  3. Hipparcos Satellite Before Launch

  4. GAIA – A Planned Future Mission

  5. Estimating the Distance to a Stop Light

  6. Cepheid Variable Stars

  7. The Period-Luminosity Relation for Cepheid Variable Stars Henrietta Leavitt

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

  9. Distances from Type 1a Supernovae

  10. Mass Discovery of Type 1a Supernovae

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

  12. SNAP – A Planned Mission toMeasure Distances to Type 1a Supernovae

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