Confirmation of Earth-Mass Planets Orbiting the Millisecond Pulsar PSR B1257 + 12

@article{Wolszczan1994ConfirmationOE,
  title={Confirmation of Earth-Mass Planets Orbiting the Millisecond Pulsar PSR B1257 + 12},
  author={Alex Wolszczan},
  journal={Science},
  year={1994},
  volume={264},
  pages={538 - 542}
}
The discovery of two Earth-mass planets orbiting an old (∼109 years), rapidly spinning neutron star, the 6.2-millisecond radio pulsar PSR B1257+12, was announced in early 1992. It was soon pointed out that the approximately 3:2 ratio of the planets' orbital periods should lead to accurately predictable and possibly measurable gravitational perturbations of their orbits. The unambiguous detection of this effect, after 3 years of systematic timing observations of PSR B1257+12 with the 305-meter… 

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