Neutron stars may be used as GPS for deep space travel: NASA
The first-ever mission to study rotating neutron stars, city-sized radiation-emitting objects weighing about two solar masses, was launched by NASA in June. Some neutron stars' rotation rate is more stable than the best atomic clocks that are there on Earth. Neutron stars could thus contribute to a natural Galactic (rather than Global) Positioning System for interstellar navigation, NASA said.