Superbubbles in galaxy NGC 3079. Composite image combining X-rays and visible light, showing large bubbles (purple) thousands of light years across, seen either side of the galaxy's central supermassive black hole (lower right). The bubbles have been created by high-energy interactions between the galactic material, either from the supermassive black hole or from newly formed stars. NGC 3079 is a barred spiral galaxy about 50 million light years away, in the constellation of Ursa Major. The image data is from the Chandra X-ray Observatory (CXO) and the Hubble Space Telescope (HST). Image published in 2019.