A cosmic flare-up called the Cow seems to have left behind a black hole or neutron star. When the flash was spotted in June 2018, astronomers debated its origins. Now, astrophysicist DJ Pasham of ...

The Cow (not pictured here) might be a black hole or a neutron star like the one at the center of supernova remnant RCW 103 (shown). Image: X-ray: NASA/CXC/University of Amsterdam/N.Rea et al ...