Description: (Dutch Astronomer)
Jan Hendrik Oort, a Dutch astronomer, made significant contributions to understanding the Milky Way and advancing radio astronomy. His discoveries included determining the rotation of the Milky Way, proposing the existence of dark matter, and identifying the galactic halo. Oort also studied comets, expanding our knowledge of the solar system. As a result of his work, various astronomical phenomena were named after him, such as the Oort cloud, Oort constants, and asteroid 1691 Oort. Oort's research elevated the Netherlands in the field of astronomy post-World War II and solidified his reputation as one of the most influential astronomers of the 20th century.