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Jun 22, 2024 · Early observations made by Allan Sandage (PhD ’53) of the Carnegie Observatories narrowed in on the age and expansion rate of the universe, validating the scientific legitimacy of observational...
3 days ago · The value of the Hubble constant was the topic of a long and rather bitter controversy between Gérard de Vaucouleurs, who claimed the value was around 100, and Allan Sandage, who claimed the value was near 50.
5 days ago · The work of American astronomer Allan Sandage and his collaborators proved without a doubt that the range in age for globular clusters was relatively small and that the detailed characteristics of the giant branches of their colour-magnitude diagrams were correlated with age and small differences in chemical abundances. On the other hand, stars ...
6 days ago · A defining moment in Tinsley’s career occurred in 1967 when Tinsley, at just 26 years old, courageously criticized renowned astronomer Allan Sandage during his lecture at the University of Texas at Dallas.
Jul 9, 2024 · Chapter 4 explores the role of multiple measurements, robustness, and consilience in the debate. In particular, I assess two methods developed for constructing and testing distance ladders with multiple measurements: Gérard de Vaucouleurs's spreading the risks method and Allan Sandage and Gustav Tammann's precision indicators method.
Jun 19, 2024 · Galaxies are the units of matter that define the granular structure of the universe,” wrote Allan Sandage in the Hubble Atlas of Galaxies.
4 days ago · In The Hubble Atlas of Galaxies (1961), the American astronomer Allan R. Sandage drew on Hubble’s notes and his own research on galaxy morphology to revise the Hubble classification scheme.
