Historical person
Historical biography and chronological timeline for Jan Oort, based on 1 World History Database records associated with Netherlands.
Oort was studying stellar motions in the local galactic neighbourhood and found that the mass in the galactic plane must be greater than what was observed. Dark matter is postulated by Jan Oort based upon insufficient evidence, to account for the orbital velocities of stars in the Milky Way
This biography is assembled from World History Database records filtered by country and personal-name fields. Exact duplicate display records are removed. The database is an index rather than a complete narrative biography; formal research should verify entries against relevant primary or specialist sources.