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Allan Sandage was an observational astronomer who was happiest at atelescope. On Hubble's sudden death Allan Sandage inherited the programmesusing the world's largest optical telescope at Palomar to determine thedistances and number counts of galaxies. Over many years he greatly revised thedistance scale and, on re-working Hubble's analysis, discovered the error thathad led Hubble to doubt the interpretation of the galaxies' redshifts as anexpansion of the universe. Sandage showed that there was a consistent age ofCreation for the stars, the elements, and the Cosmos. Through work with Baadeand Schwarzschild he discovered the key to the interpretation of thecolour-magnitude diagrams of star clusters in terms of stellar evolution. Withothers he founded Galactic Archaeology, interpreting the motions and elementalabundances of the oldest stars in terms of a model for the Galaxy's formation.He published several fine atlasses and catalogues of galaxies and a definitivehistory of the Mount Wilson Observatory.

Allan R. Sandage, 18 June 1926 - 13 November 2010