A two-solar-mass neutron star measured using Shapiro delay

@article{Demorest2010ATN,
  title={A two-solar-mass neutron star measured using Shapiro delay},
  author={Paul B. Demorest and Timothy T. Pennucci and Scott M. Ransom and Mallory S. E. Roberts and Jason W. T. Hessels},
  journal={Nature},
  year={2010},
  volume={467},
  pages={1081-1083}
}
Neutron stars are composed of the densest form of matter known to exist in our Universe, the composition and properties of which are still theoretically uncertain. Measurements of the masses or radii of these objects can strongly constrain the neutron star matter equation of state and rule out theoretical models of their composition. The observed range of neutron star masses, however, has hitherto been too narrow to rule out many predictions of ‘exotic’ non-nucleonic components. The Shapiro… 

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