A city-sized collapsed star has generated a beam of matter and antimatter that stretches for trillions of kilometers. This discovery could help explain the presence of positrons detected throughout the Milky Way galaxy and here on Earth. More: https://t.co/E7A3ZjgUT6 pic.twitter.com/YnPkU4N1Z5

— Chandra Observatory (@chandraxray) March 14, 2022