Jan Hendrik Oort , 1900-1992, Dutch astronomer. He confirmed (1927) Bertil Lindblad's theory of the Milky Way galaxy's rotation. In the 1950s he and his colleagues used radio astronomical means to map the spiral-arm structure of the galaxy. Oort proposed (1950) that comets originate in a cloud of material (the Oort cloud ) orbiting the sun at great distance and that they are occasionally deflected into the inner solar system by gravitational perturbation from the passing of nearby stars.
Author not available, OORT, JAN HENDRIK.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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Hardcovers in Brief
The Washington Post; 5/20/1990; 1053 words;
... comes complete with a glossary, and the text is interspersed with capsule biographies of famous astronomers, such as Jan Hendrik Oort, the Dutchman whose theory that all comets are escapees from a swarm of them at the outer reaches of the solar system ...
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Scientists get a glimpse of universe's 'invisible' matter.(USA)
The Christian Science Monitor; 3/23/2001; 765 words;
... Decades-old puzzle The idea that the Milky Way was affected by unseen matter first appeared in 1932, when Dutch astronomer Jan Hendrik Oort proposed it to explain what appeared to him to be unusual motions among stars in the galaxy's disk. A year later ...
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