Nature Astronomy
This journal welcomes research across astronomy, astrophysics and planetary science, with the aim of fostering closer interaction between the researchers in each of these areas.
Ultra-high-energy gamma rays in the Cygnus Cocoon
What is the source of the highest-energy cosmic rays in our Galaxy? We report here the observation of the ultra-high-energy gamma-ray emission from a stellar superbubble in the Cygnus region, powered by the massive stellar complex called Cygnus OB2 in an attempt to answer this question.