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The Cosmic Distance Ladder

The Cosmic Distance Ladder. Where it takes us and how. Alankar Kotwal. IITB. Earth. Why Ladder?. Decreasing accuracy, in general. Distances in Astronomy are BIG!. Distances measured by their effects, not by a ruler!. Direct Measurement. 1 au. Radar => Distance to a few cm!.

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The Cosmic Distance Ladder

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  1. The Cosmic Distance Ladder Where it takes us and how Alankar Kotwal IITB Earth

  2. Why Ladder? Decreasing accuracy, in general

  3. Distances in Astronomy are BIG! Distances measured by their effects, not by a ruler!

  4. Direct Measurement 1 au Radar => Distance to a few cm!

  5. Beyond the Solar System 1 arcsec 1 pc

  6. Moving Clusters

  7. Far beyond

  8. Let there be some light r L R

  9. What next? Previous method again! = -2.43[log(P)-1]-4.05

  10. Supernovae!

  11. Extreme Distances

  12. Velocity Dispersions

  13. Rotation Curves

  14. Predictive Methods x

  15. Image Pixel Photo-Z

  16. Astronomers are always coming up with new ways of measuring distances

  17. Thank You! Questions? NO aliens, UFOs or God please!

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