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An artist’s impression of the Double Pulsar system in which the two pulsars orbit each other every 2.5 hours and send out high-energy beams that sweep across the sky. Image credit: John Rowe Animations/CSIRO

We counted 20 billion ticks of an extreme galactic clock to give Einstein’s theory of gravity its toughest test yet

Adam Deller, Swinburne University of Technology and Richard Manchester, CSIRO

Astronomers watched a pair of pulsars for 16 years to test the theory of general relativity, which has stood unchallenged for over a century.

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