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Jan Oort

astronomy
Maarten Schmidt and the Phenomenon of Quasars

Maarten Schmidt and the Phenomenon of Quasars

Harald Sack
On December 28, 1929, Dutch astronomer Maarten Schmidt was born. Schmidt is best known for measuring the distances of quasars. Quasars or quasi-stellar radio sources are the most energetic and distant members of a class of objects called active galactic nuclei (AGN). Quasars are extremely luminous and were first identified as being high redshift sources of electromagnetic energy, including radio waves and visible light, that appeared to be similar to stars, rather…
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astronomy
Modern Planetary Science with Gerard Kuiper

Modern Planetary Science with Gerard Kuiper

Tabea Tietz
On December 7, 1905, Dutch-American astronomer Gerard Peter Kuiper was born. Considered by many to be the father of modern planetary science, Kuiper is the eponymous namesake of the Kuiper belt, a region of the Solar System beyond the planets, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun. Kuiper also discovered Miranda, a moon of Uranus, and Nereid, a moon of Neptune. “The Kuiper Belt…
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astronomy
Jan Hendrik Oort and the Secrets of the Oort Cloud

Jan Hendrik Oort and the Secrets of the Oort Cloud

Tabea Tietz
On April 28, 1900, Dutch physicist and astronomer Jan Hendrik Oort was born. One of the greatest astronomers of the 20th century, Oort made significant contributions to the understanding of the Milky Way and who was a pioneer in the field of radio astronomy. Oort determined that the Milky Way rotates and overturned the idea that the sun is at its center; he discovered mysterious invisible ‘dark matter‘ in 1932, as well…
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astronomy
Jacobus Cornelius Kapteyn and the Rotation of the Milky Way

Jacobus Cornelius Kapteyn and the Rotation of the Milky Way

Harald Sack
On June 18, 1922, Dutch astronomer Jacobus Cornelius Kapteyn passed away. Kapteyn carried out extensive studies of the Milky Way and was the discoverer of evidence for galactic rotation. He used photography and statistical methods in determining the motions and spatial distribution of stars, the first major step after the works of William and John Herschel.[6,7] Jacobus C. Kapteyn – Early Year Jacobus Cornelius Kapteyn was born on 19 January 1851 in…
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