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Home > Robert Julius Trumpler

Robert Julius Trumpler ( October 2 1886 – September 10 1956) was a Swiss-American astronomer.

He was born in Zurich. In 1915, he came to the United States to take a position at Allegheny Observatory , and later went to Lick Observatory.

He is best known for his work on galactic clusters, demonstrating the phenomenon of absorption of light (extinction) by interstellar dust.

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