By Adriaan Blaauw (auth.), Hugo van Woerden, Willem N. Brouw, Henk C. van de Hulst (eds.)

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Extra info for Oort and the Universe: A Sketch of Oort’s Research and Person

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The subj RCt has continued to develop and presents challenges in both galactic and extra-galactic research. Westerhout led to the identification of HII regions, many of which were invisible to the optical observer because of interstellar absorption. This work had considerable influence on the following development of radio-astronomical galactic research, in particular concerning problems of star formation. During the 1950's there occurred a striking development in radio astronomy in areas other than 21-cm hydrogen line research.

0 Copenhagen with Bertil Lindblad. er home in Tisvilde in order to discuss the proposed pIan with him. Niels Bohr's very positive reac:"ion to the p~an strengthened our belief in its excellence anG feasibility. thern Observatory. ed by five member countries: :Selgimn, France, the Nether] ancis, Sweden and '';-est Germany. Denmark l)ecame ESO I s sixth meml)er in 1967. The story of the development of ESO into 8, flourishing organization has been told in other cO~'1texts. Suffice it here to mention that.

A. Huller with the,. 5-meter rallio telescope in Kootwijk, are presented. There is no doubt that this contribution by Jan Oort had a profound influence on the attitude of astro~omers allover the world to"rard the r~ew discipline of radio astronomy, and that it greatly helped its deve~opment during the years thereafter. 5-mcter radio telescope was used to chart the sky in the 21-cm line. There followed the demonstTation by Jan Oort and his collaborators that interstellar neutral hydrogen is concentrated in relatively carrow arms, analogous to the spiral arms observed in extragalactic systems.

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