An introduction to pulsars and neutron stars that focuses on the properties that allow us to use them as extremely precise celestial clocks. Part of an ongoing series on the NANOGrav collaboration.

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NANOGrav: http://www.nanograv.org

Pulsar sounds and profiles from the Jodrell Bank Telescope website
http://www.jb.man.ac.uk/
http://www.jb.man.ac.uk/pulsar/Education/Sounds/sounds.html

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