Circinus X-1: Astronomers Discover X-ray Rings around Neutron Star

Astronomers using data from NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton telescope have discovered a bright X-ray light echo in the form of four well-defined rings around the neutron star at the center of an X-ray binary system called Circinus X-1. The new Chandra data have also provided a rare opportunity to determine the distance [...] —> Read More