Lightest double neutron star system challenges Einstein's theory

Astronomers have discovered PSR J1856-0039, the least massive double neutron star system ever detected, using China's Five-hundred-meter Aperture Spherical Radio Telescope. With a total mass of 2.49 solar masses, this system validates Einstein's General Relativity with less than one percent error and is expected to collide within 82 million years.

The measured rate of orbital decay agrees with the prediction made by general relativity with an error of less than one percent, providing some of the strongest support for Einstein's theory.