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3.1 Cosmic Distance Ladder

3.1 Cosmic Distance Ladder. From these methods: Determine distance (see p 615 including Fig 20.16) . From these methods: Determine distance (see p 626 including Fig 20.16) . From these methods: Determine distance (see p 626 including Fig 20.16) .

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3.1 Cosmic Distance Ladder

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  1. 3.1 Cosmic Distance Ladder

  2. From these methods: Determine distance (see p 615 including Fig 20.16)

  3. From these methods: Determine distance (see p 626 including Fig 20.16)

  4. From these methods: Determine distance (see p 626 including Fig 20.16)

  5. Use surface temperature of “main sequence stars” to infer Luminosity. Given luminosity infer distance (see p 626 including Fig 20.16)

  6. Use pulsation period of variable starts (“Cepheids”) to infer luminosity Given luminosity infer distance (see p 626 including Fig 20.16)

  7. Use “Tully-Fisher relation” to infer galaxy luminosity from rotation speed Given luminosity infer distance (see p 626 including Fig 20.16)

  8. Use “Tully-Fisher relation” to infer galaxy luminosity from rotation speed Given luminosity infer distance (see p 626 including Fig 20.16)

  9. From these methods: Determine distance (see p 641)

  10. 3.2 The Redshift

  11. Fig 20.15A redshifted galaxy spectrum Redshift: For small z

  12. 3.3 The Hubble law

  13. Putting together info about speed v and distance d reveals remarkably simple behavior: Km/Sec/Megaparsec 1 Megaparsec = 3.3 million lightyears

  14. Special feature of the Hubble law: It looks the same from any position:

  15. The Big Bang

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