KnowraJan OortLinked fromLinked fromThe 5 pages that link to Jan Oort, each with the reason it gives.All 5Related 5Oort cloudRelated: Oort argued in 1950 that a distant reservoir could explain the observed orbits of long-period comets.Fritz ZwickyRelated: Oort independently found mass discrepancies in galaxies, placing Zwicky’s cluster result in a wider context.European Southern ObservatoryRelated: He helped advance the proposal for a European southern observatory.Vera RubinRelated: His analyses of galactic motions formed part of the earlier observational context for unseen mass.Robert BrownRelated: His work helped frame the Galactic-center questions addressed by later radio astronomy.