Astronomers have discovered the largest known cloud of energetic particles surrounding a galaxy cluster — the 20-million-light-year-wide cloud around the galaxy cluster PLCK G287.0+32.9. This new composite image made with X-rays from NASA’s Chandra X-ray Observatory (blue and purple), radio data from the MeerKAT radio telescope (orange and yellow), and an optical image from PanSTARRS (red, green, and blue) shows the massive galaxy cluster...
