Allan R. Sandage dies at 84; cosmologist focused on the age of the universe

The scientist, an assistant to Edwin Hubble in the 1950s, believed the universe to be about 15 billion years old rather than the 12 billion that NASA research has shown.Astronomer Allan R. Sandage of Pasadena's Carnegie Observatories, one of the most prominent cosmologists of the 20th century who spent the better part of his lifetime trying to determine the precise age of the universe, died Saturday at his home in San Gabriel. He was 84 and had been suffering from pancreatic cancer.

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