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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.
A crater on Mars is named in his honour.
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