2. 1934

    Baade & Zwicky

    Proposed such a star

  3. 1939

    Oppenheimer and Volloff

    Calculation using ideal gas of free neutrons

  4. About 30 years, Not much attention. Some discussions about EoS.

  5. 1962

    Giacconi et al

    nonsolar X-ray source

  6. 1963

    Schmidt

    First QSO (quasi-stellar object)

  8. 1967

    Jocelyn Bell Burnell and Antony Hewish

    Discovery of pulsars

  9. 1968

    Gold

    Proposed that pulsars were rotating neutron stars

  10. 1968

    Large, Vaughan, Mills;Staelin, Reifenstein, Richards, Comella

    Discovery of Crab and Vela pulsars -> Supernova remnants

  11. 1971

    UHURU satellite

    X-ray pulsars

  12. 1975

    Hulse & Taylor

    First binary pulsar -> mass of neutron star, GW