Jan Hendrik Oort ForMemRS (/ˈɔːrt/ or /ˈʊərt/; 28 April 1900 – 5 November 1992) was a Dutch astronomer who made significant contributions to the understanding...

cloud was proposed in 1950 by the Dutch astronomer Jan Oort, in whose honor the idea was named. Oort proposed that the bodies in this cloud replenish and...

populations. In the abstract of the article by Baade, he recognizes that Jan Oort originally conceived this type of classification in 1926. Baade observed...

observed. Dutchman and radio astronomy pioneer Jan Oort also hypothesized the existence of dark matter in 1932. Oort was studying stellar motions in the local...

Oort is a Dutch toponymic surname most commonly referring to the astronomer Jan Oort. Oort was one spelling of a Middle Dutch word for "edge" or "end"...

cloud (also called the inner Oort cloud and inner cloud) is a theoretical vast circumstellar disc, interior to the Oort cloud, whose outer border would...

and social worker Jan Oblak (born 1993), Slovenian professional footballer (goalkeeper) Jan Oort (1900–1992), Dutch astronomer Jan Õun (born 1977), Estonian...

The Oort limit is a theoretical location at the outer limits of the Oort cloud, where the amount of comets and minor planets orbiting the Sun drops drastically...

Chandrasekhar revised the models of stellar dynamics first outlined by Jan Oort and others by considering the effects of fluctuating gravitational fields...

The Oort constants (discovered by Jan Oort) A {\displaystyle A} and B {\displaystyle B} are empirically derived parameters that characterize the local...

(1920s), with some plausibility by 1939, and beyond reasonable doubt by Jan Oort in 1942. In 1921, Carl Otto Lampland was the first to announce that he...

dynamics (MOND), which involves modifying the laws of gravity. In 1932, Jan Hendrik Oort became the first to report that measurements of the stars in the solar...

(The existence of two distinct populations had been noted earlier by Jan Oort.) Baade also discovered that there were two types of Cepheid variable stars...

ultimately led to the finding of galactic rotation by Bertil Lindblad and Jan Oort.[citation needed] In 1917, Heber Doust Curtis had observed the nova S Andromedae...

1951. Using the radio telescope at the Kootwijk Observatory, Muller and Oort reported the detection of the hydrogen emission line in May of that same...

Telfer as the voice of an angry scholar Michael Chochol as the voice of Jan Oort Kirsten Dunst as the voice of Cecilia Payne-Gaposchkin Cary Elwes as the...

astronomer Jan Oort. is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. Oort orbits the...

is the Oort cloud, possibly a spherical swarm of comets extending beyond 50,000 AU from the Sun first hypothesised by Dutch astronomer Jan Oort in 1950...

directed the observatory include Willem de Sitter, Ejnar Hertzsprung and Jan Oort. Leiden University established the observatory in 1633; astronomy had been...

lines. Lynds was the first to describe them as the "Lyman-alpha forest". Jan Oort argued that the absorption features are due not to any physical interactions...

Frank J. Kerr John D. Kraus Bernard Lovell Christiaan Alexander Muller Jan Oort Joseph Lade Pawsey Ruby Payne-Scott Arno Penzias Grote Reber Martin Ryle...

interstellar hydrogen. After this line was discovered, he participated, with Jan Oort and Lex Muller, in the effort to use radio astronomy to map out the neutral...

an astronomer, and the son of astronomer Jan Woltjer. He studied at the University of Leiden under Jan Oort earning a PhD in astronomy in 1957 with a...

designed the receiver system. Because of his work with Dutch astronomer Jan Oort on the determination of the spiral structure of the Milky Way using the...

Dutch physicist, worked on Brownian motion and electrical noise theory Jan Oort (1900–1992) Dutch astronomer, pioneer in radio astronomy Hendrik Casimir...

following year. He then commenced doctoral studies at Leiden University under Jan Oort. Schmidt was awarded a Doctor of Philosophy from Leiden Observatory in...

Signals have travelled". Science Alert. Jan 20, 2021. Archived from the original on January 26, 2021. Retrieved Jan 20, 2021. Siemion, Andrew (September...

taught by Ejnar Hertzsprung, Antonie Pannekoek, Willem de Sitter, Jan Woltjer, Jan Oort, and the physicist Paul Ehrenfest. He received his candidate degree...

the Galaxy. These discoveries were published in 1940 and were noted by Jan Oort who knew that significant advances could be made in astronomy if there...

Frank J. Kerr John D. Kraus Bernard Lovell Christiaan Alexander Muller Jan Oort Joseph Lade Pawsey Ruby Payne-Scott Arno Penzias Grote Reber Martin Ryle...