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Hubble law  Hubble-Lemaitre law?

Hubble law  Hubble-Lemaitre law?. Others at the time. xx. Hubble constant prior to 1996. xx. Hubble constant in recent years. xx. Others at the time. xx. 3 different classes of mechanisms. xx. 3 different classes of mechanisms. xx. 3 different classes of mechanisms. xx.

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Hubble law  Hubble-Lemaitre law?

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  1. Hubble law  Hubble-Lemaitre law?

  2. Others at the time • xx

  3. Hubble constant prior to 1996 • xx

  4. Hubble constant in recent years • xx

  5. Others at the time • xx

  6. 3 different classes of mechanisms • xx

  7. 3 different classes of mechanisms • xx

  8. 3 different classes of mechanisms • xx

  9. Hubble (1929) V0 = K x D

  10. Lemaitre (1927)

  11. At earlier times

  12. 3 different classes of mechanisms

  13. xx

  14. The criticism • Kragh’s criticism is based on the distinction between the law (v=H*r) and the expansion • Hubble showed that the relation is linear • Lemaitre didn’t have such a plot (but an equation) and focused more on expansion • I found his 2003 with Smith most useful!

  15. Kragh+Smith (2003) • Explains why Kragh is so dismissive • Lemaitre didn’t show a plot

  16. Kragh+Smith (2003) about Hubble • But Hubble didn’t think of expansion!

  17. Eddington (1930) • Focus on expansion • Mentioned Lemaitre in positive light • Hubble not mentioned • But: observations also not

  18. Final comments • In my view, the distinction (linear or not) is minor; his equation (24) gives linear relation • Both results (Hubble 500, Lemaitre 625) are based on earlier observations by Lundmark and Stromberg for radial velocities, and Hubble for apparent magnitudes  distances • Earlier observations in isolation not conclusive regarding distance and speed • Shortcomings both for Hubble (expansion not mentioned) and Lemaitre (no plot) • Both must be acknowledged

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